It's a recent problem, but my system is suddenly bogged down, and crawling, when it used to be quite fast. It's especially an issue with any internet-accessing programs. winlogon.exe and svchost.exe are taking up ~40% of the CPU at all times, and there's a constant load of almost 90%.

Here's my HJT log. Please help if you can.

Logfile of HijackThis v1.99.1
Scan saved at 7:35:52 PM, on 6/26/2007
Platform: Windows XP SP2 (WinNT 5.01.2600)
MSIE: Internet Explorer v7.00 (7.00.6000.16473)

Running processes:
C:\WINDOWS\System32\smss.exe
C:\WINDOWS\system32\winlogon.exe
C:\WINDOWS\system32\services.exe
C:\WINDOWS\system32\lsass.exe
C:\WINDOWS\system32\svchost.exe
C:\Program Files\Windows Defender\MsMpEng.exe
C:\WINDOWS\System32\svchost.exe
C:\Program Files\Ahead\InCD\InCDsrv.exe
J:\Program Files\Alwil Software\Avast4\aswUpdSv.exe
J:\Program Files\Alwil Software\Avast4\ashServ.exe
C:\WINDOWS\system32\LEXBCES.EXE
C:\WINDOWS\system32\spoolsv.exe
C:\PROGRA~1\COMMON~1\AOL\ACS\acsd.exe
C:\PROGRA~1\Grisoft\AVG7\avgupsvc.exe
C:\Program Files\CA\eTrust Internet Security Suite\eTrust EZ Antivirus\ISafe.exe
C:\Program Files\Common Files\Symantec Shared\ccSetMgr.exe
C:\WINDOWS\system32\CTsvcCDA.exe
C:\Program Files\DRoster\Firebird\bin\fbguard.exe
C:\Program Files\Norton AntiVirus\SAVScan.exe
C:\WINDOWS\System32\tcpsvcs.exe
C:\WINDOWS\System32\snmp.exe
C:\WINDOWS\System32\svchost.exe
C:\Program Files\CA\eTrust Internet Security Suite\eTrust EZ Antivirus\VetMsg.exe
C:\WINDOWS\system32\ZoneLabs\vsmon.exe
C:\WINDOWS\wanmpsvc.exe
C:\WINDOWS\system32\MsPMSPSv.exe
J:\Program Files\Alwil Software\Avast4\ashMaiSv.exe
J:\Program Files\Alwil Software\Avast4\ashWebSv.exe
C:\Program Files\DRoster\Firebird\bin\fbserver.exe
C:\WINDOWS\explorer.exe
C:\Program Files\Trillian\trillian.exe
C:\WINDOWS\system32\ctfmon.exe
C:\Program Files\Zone Labs\ZoneAlarm\zlclient.exe
C:\PROGRA~1\Grisoft\AVG7\avgamsvr.exe
C:\PROGRA~1\Grisoft\AVG7\avgemc.exe
C:\Program Files\Grisoft\AVG7\avgcc.exe
C:\Program Files\mIRC 6.17\mirc.exe
C:\Program Files\Mozilla Firefox\firefox.exe
C:\DOCUME~1\Zack\LOCALS~1\Temp\Temporary Directory 2 for hijackthis.zip\HijackThis.exe
C:\WINDOWS\explorer.exe

R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Default_Search_URL = about:blank
R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Search Page = about:blank
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Page_URL = http://go.microsoft.com/fwlink/?LinkId=69157
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Search_URL = http://go.microsoft.com/fwlink/?LinkId=54896
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Search Bar = about:blank
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Search Page = http://go.microsoft.com/fwlink/?LinkId=54896
R0 - HKLM\Software\Microsoft\Internet Explorer\Main,Start Page = http://go.microsoft.com/fwlink/?LinkId=69157
N2 - Netscape 6: # Mozilla User Preferences
// This is a generated file!

user_pref("browser.download.dir", "C:\\Documents and Settings\\Zack\\My Documents\\My Pictures");
user_pref("browser.history.last_page_visited", "http://view.atdmt.com/AVE/iview/msnnkonm00200074ave/direct;wi.309;hi.60/01?click=");
user_pref("browser.search.defaultengine", "engine://C%3A%5CProgram%20Files%5CNetscape%5CNetscape%206%5Csearchplugins%5CSBWeb_01.src");
user_pref("browser.startup.homepage_override.mstone", "rv:0.9.4");
user_pref("intl.charsetmenu.browser.cache", "UTF-8");
user_pref("prefs.converted-to-utf8", true);
user_pref("security.warn_entering_secure", false);
user_pref("security.warn_leaving_secure", false);
user_pref("security.warn_submit_insecure", false);
user_pref("signon.SignonFileName", "2826651.s");
user_pref("timebomb.first_launch_time", "1102826627734000");
user_pref("wallet.SchemaValueFileName", "2826684.w");
user_pref("browser.helperApps.neverAsk.openFile", "application%2Fx-java-jnlp-file");
(C:\Documents and
O1 - Hosts: 216.39.69.102 view.atdmt.com
O2 - BHO: AcroIEHlprObj Class - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - C:\Program Files\Adobe\Acrobat 7.0\ActiveX\AcroIEHelper.dll
O2 - BHO: (no name) - {4D91D49C-30D2-4F7E-8CA3-5E39D9B3D165} - C:\WINDOWS\system32\vturs.dll (file missing)
O2 - BHO: (no name) - {5440895F-4A1B-461F-ACCE-E29F879A4B8D} - C:\WINDOWS\system32\ddayx.dll (file missing)
O2 - BHO: (no name) - {5ADF3862-9E2E-4ad3-86F7-4510E6550CD0} - C:\WINDOWS\system32\uynhmcrf.dll (file missing)
O2 - BHO: SSVHelper Class - {761497BB-D6F0-462C-B6EB-D4DAF1D92D43} - C:\Program Files\Java\jre1.5.0_06\bin\ssv.dll
O2 - BHO: (no name) - {7C24493F-3D23-4258-9426-42C5FC3B8211} - C:\WINDOWS\system32\gebaaxv.dll
O2 - BHO: (no name) - {7E853D72-626A-48EC-A868-BA8D5E23E045} - (no file)
O2 - BHO: (no name) - {8F6F7A7E-CF1F-4261-B8FE-9EF4D13F6B08} - C:\WINDOWS\system32\ddayx.dll (file missing)
O4 - HKLM\..\Run: [Zone Labs Client] "C:\Program Files\Zone Labs\ZoneAlarm\zlclient.exe"
O4 - HKLM\..\Run: [CTSysVol] C:\Program Files\Creative\SBAudigy2ZS\Surround Mixer\CTSysVol.exe /r
O4 - HKLM\..\Run: [CTDVDDET] C:\Program Files\Creative\SBAudigy2ZS\DVDAudio\CTDVDDet.EXE
O4 - HKLM\..\Run: [SBDrvDet] C:\Program Files\Creative\SB Drive Det\SBDrvDet.exe /r
O4 - HKLM\..\Run: [avast!] J:\PROGRA~1\ALWILS~1\Avast4\ashDisp.exe
O4 - HKLM\..\Run: [MSConfig] C:\WINDOWS\PCHealth\HelpCtr\Binaries\MSConfig.exe /auto
O4 - HKLM\..\Run: [AVG7_CC] C:\PROGRA~1\Grisoft\AVG7\avgcc.exe /STARTUP
O4 - HKCU\..\Run: [ctfmon.exe] C:\WINDOWS\system32\ctfmon.exe
O4 - HKCU\..\Run: [RemoteCenter] C:\Program Files\Creative\MediaSource\RemoteControl\RCMan.EXE
O4 - Startup: Adobe Gamma.lnk = C:\Program Files\Common Files\Adobe\Calibration\Adobe Gamma Loader.exe
O4 - Startup: Trillian.lnk = C:\Program Files\Trillian\trillian.exe
O8 - Extra context menu item: &Search - http://bar.mywebsearch.com/menusearc...S_ZCYYYYYYYYUS
O8 - Extra context menu item: E&xport to Microsoft Excel - res://C:\PROGRA~1\MI1933~1\OFFICE11\EXCEL.EXE/3000
O9 - Extra button: (no name) - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\Program Files\Java\jre1.5.0_06\bin\ssv.dll
O9 - Extra 'Tools' menuitem: Sun Java Console - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\Program Files\Java\jre1.5.0_06\bin\ssv.dll
O9 - Extra button: Run WinHTTrack - {36ECAF82-3300-8F84-092E-AFF36D6C7040} - C:\Program Files\WinHTTrack\WinHTTrackIEBar.dll
O9 - Extra 'Tools' menuitem: Launch WinHTTrack - {36ECAF82-3300-8F84-092E-AFF36D6C7040} - C:\Program Files\WinHTTrack\WinHTTrackIEBar.dll
O9 - Extra button: Research - {92780B25-18CC-41C8-B9BE-3C9C571A8263} - C:\PROGRA~1\MI1933~1\OFFICE11\REFIEBAR.DLL
O9 - Extra button: AIM - {AC9E2541-2814-11d5-BC6D-00B0D0A1DE45} - C:\Program Files\aim\aim.exe
O9 - Extra button: Real.com - {CD67F990-D8E9-11d2-98FE-00C0F0318AFE} - C:\WINDOWS\System32\Shdocvw.dll
O9 - Extra button: (no name) - {e2e2dd38-d088-4134-82b7-f2ba38496583} - %windir%\Network Diagnostic\xpnetdiag.exe (file missing)
O9 - Extra 'Tools' menuitem: @xpsp3res.dll,-20001 - {e2e2dd38-d088-4134-82b7-f2ba38496583} - %windir%\Network Diagnostic\xpnetdiag.exe (file missing)
O9 - Extra button: Messenger - {FB5F1910-F110-11d2-BB9E-00C04F795683} - C:\Program Files\Messenger\msmsgs.exe (file missing)
O9 - Extra 'Tools' menuitem: Windows Messenger - {FB5F1910-F110-11d2-BB9E-00C04F795683} - C:\Program Files\Messenger\msmsgs.exe (file missing)
O11 - Options group: [INTERNATIONAL] International*
O14 - IERESET.INF: START_PAGE_URL=http://www.emachines.com
O16 - DPF: {00B71CFB-6864-4346-A978-C0A14556272C} (Checkers Class) - http://messenger.zone.msn.com/binary...r.cab31267.cab
O16 - DPF: {04E214E5-63AF-4236-83C6-A7ADCBF9BD02} (HouseCall Control) - http://housecall60.trendmicro.com/housecall/xscan60.cab
O16 - DPF: {0E5F0222-96B9-11D3-8997-00104BD12D94} (PCPitstop Utility) - http://www.pcpitstop.com/pcpitstop/PCPitStop.CAB
O16 - DPF: {11260943-421B-11D0-8EAC-0000C07D88CF} (iPIX ActiveX Control) - http://www.ipix.com/download/ipixx.cab
O16 - DPF: {1239CC52-59EF-4DFA-8C61-90FFA846DF7E} (Musicnotes Viewer) - http://www.musicnotes.com/download/mnviewer.cab
O16 - DPF: {14B87622-7E19-4EA8-93B3-97215F77A6BC} (MessengerStatsClient Class) - http://messenger.zone.msn.com/binary...t.cab31267.cab
O16 - DPF: {17492023-C23A-453E-A040-C7C580BBF700} (Windows Genuine Advantage Validation Tool) - http://go.microsoft.com/fwlink/?linkid=39204
O16 - DPF: {1842B0EE-B597-11D4-8997-00104BD12D94} (iCC Class) - http://www.pcpitstop.com/internet/pcpConnCheck.cab
O16 - DPF: {2917297F-F02B-4B9D-81DF-494B6333150B} (Minesweeper Flags Class) - http://messenger.zone.msn.com/binary...r.cab31267.cab
O16 - DPF: {39B0684F-D7BF-4743-B050-FDC3F48F7E3B} (FilePlanet Download Control Class) - http://www.fileplanet.com/fpdlmgr/ca...C_1_0_0_44.cab
O16 - DPF: {6E32070A-766D-4EE6-879C-DC1FA91D2FC3} (MUWebControl Class) - http://update.microsoft.com/microsof...?1126088404640
O16 - DPF: {74CD40EA-EF77-4BAD-808A-B5982DA73F20} - http://yax-download.yazzle.net/Yazzl...cab?refid=1123
O16 - DPF: {7B297BFD-85E4-4092-B2AF-16A91B2EA103} (WScanCtl Class) - http://www3.ca.com/securityadvisor/v...fo/webscan.cab
O16 - DPF: {7F8C8173-AD80-4807-AA75-5672F22B4582} (ICSScanner Class) - http://download.zonelabs.com/bin/pro...anner37240.cab
O16 - DPF: {8E0D4DE5-3180-4024-A327-4DFAD1796A8D} (MessengerStatsClient Class) - http://messenger.zone.msn.com/binary...t.cab31267.cab
O16 - DPF: {917623D1-D8E5-11D2-BE8B-00104B06BDE3} (CamImage Class) - http://207.74.27.142/activex/AxisCamControl.cab
O16 - DPF: {9A9307A0-7DA4-4DAF-B042-5009F29E09E1} (ActiveScan Installer Class) - http://acs.pandasoftware.com/actives...ree/asinst.cab
O16 - DPF: {9AA73F41-EC64-489E-9A73-9CD52E528BC4} (ZoneAxRcMgr Class) - http://messenger.zone.msn.com/binary/ZAxRcMgr.cab
O16 - DPF: {A16C2BF4-501E-45FA-8A14-F26E022D5E16} (MidRadioCtrl Class) - http://download.music-eclub.com/mrplayer/win/mrinst.cab
O16 - DPF: {A8F2B9BD-A6A0-486A-9744-18920D898429} (ScorchPlugin Class) - http://www.sibelius.com/download/sof...iveXPlugin.cab
O16 - DPF: {A90A5822-F108-45AD-8482-9BC8B12DD539} (Crucial cpcScan) - http://www.crucial.com/controls/cpcScanner.cab
O16 - DPF: {B8BE5E93-A60C-4D26-A2DC-220313175592} (ZoneIntro Class) - http://zone.msn.com/binFramework/v10...o.cab34246.cab
O16 - DPF: {B9A296D4-38AC-4566-8168-F7ACAF7D35E6} (Eyeball Video Session Control) - http://imlive.com/ChatSource/gVideoContol.cab
O16 - DPF: {DF780F87-FF2B-4DF8-92D0-73DB16A1543A} - http://download.games.yahoo.com/game...ploader_v6.cab
O16 - DPF: {FE5D6722-826F-11D5-A24E-0060B0F1A5AE} (Tukati Launcher) - http://www.tukati.com/software/4/1.9.21.21/tukati.cab
O18 - Protocol: livecall - {828030A1-22C1-4009-854F-8E305202313F} - C:\PROGRA~1\MSNMES~1\MSGRAP~1.DLL
O18 - Protocol: ms-help - {314111C7-A502-11D2-BBCA-00C04F8EC294} - C:\Program Files\Common Files\Microsoft Shared\Help\hxds.dll
O18 - Protocol: msnim - {828030A1-22C1-4009-854F-8E305202313F} - C:\PROGRA~1\MSNMES~1\MSGRAP~1.DLL
O18 - Filter: text/x-mrml - {C51721BE-858B-4A66-A8BF-D2882FF49820} - C:\Program Files\YAMAHA\MidRadio Player\MidRadio.ocx
O20 - Winlogon Notify: ddayx - C:\WINDOWS\system32\ddayx.dll (file missing)
O20 - Winlogon Notify: gebaaxv - C:\WINDOWS\SYSTEM32\gebaaxv.dll
O20 - Winlogon Notify: igfxcui - C:\WINDOWS\SYSTEM32\igfxsrvc.dll
O20 - Winlogon Notify: vturs - C:\WINDOWS\system32\vturs.dll (file missing)
O20 - Winlogon Notify: WgaLogon - C:\WINDOWS\SYSTEM32\WgaLogon.dll
O20 - Winlogon Notify: winosz32 - winosz32.dll (file missing)
O20 - Winlogon Notify: winubg32 - winubg32.dll (file missing)
O21 - SSODL: WPDShServiceObj - {AAA288BA-9A4C-45B0-95D7-94D524869DB5} - C:\WINDOWS\system32\WPDShServiceObj.dll
O23 - Service: Adobe LM Service - Adobe Systems - C:\Program Files\Common Files\Adobe Systems Shared\Service\Adobelmsvc.exe
O23 - Service: AOL Connectivity Service (AOL ACS) - America Online, Inc. - C:\PROGRA~1\COMMON~1\AOL\ACS\acsd.exe
O23 - Service: AVG7 Alert Manager Server (Avg7Alrt) - GRISOFT, s.r.o. - C:\PROGRA~1\Grisoft\AVG7\avgamsvr.exe
O23 - Service: AVG7 Update Service (Avg7UpdSvc) - GRISOFT, s.r.o. - C:\PROGRA~1\Grisoft\AVG7\avgupsvc.exe
O23 - Service: AVG E-mail Scanner (AVGEMS) - GRISOFT, s.r.o. - C:\PROGRA~1\Grisoft\AVG7\avgemc.exe
O23 - Service: CAISafe - Computer Associates International, Inc. - C:\Program Files\CA\eTrust Internet Security Suite\eTrust EZ Antivirus\ISafe.exe
O23 - Service: Symantec Event Manager (ccEvtMgr) - Symantec Corporation - C:\Program Files\Common Files\Symantec Shared\ccEvtMgr.exe
O23 - Service: Symantec Password Validation (ccPwdSvc) - Symantec Corporation - C:\Program Files\Common Files\Symantec Shared\ccPwdSvc.exe
O23 - Service: Symantec Settings Manager (ccSetMgr) - Symantec Corporation - C:\Program Files\Common Files\Symantec Shared\ccSetMgr.exe
O23 - Service: Creative Service for CDROM Access - Creative Technology Ltd - C:\WINDOWS\system32\CTsvcCDA.exe
O23 - Service: DomainService - Unknown owner - C:\WINDOWS\system32\kcgmurbc.exe (file missing)
O23 - Service: Firebird Guardian - DefaultInstance (FirebirdGuardianDefaultInstance) - The Firebird Project - C:\Program Files\DRoster\Firebird\bin\fbguard.exe
O23 - Service: Firebird Server - DefaultInstance (FirebirdServerDefaultInstance) - The Firebird Project - C:\Program Files\DRoster\Firebird\bin\fbserver.exe
O23 - Service: InstallDriver Table Manager (IDriverT) - Macrovision Corporation - C:\Program Files\Common Files\InstallShield\Driver\11\Intel 32\IDriverT.exe
O23 - Service: Imapi Helper - Alex Feinman - J:\ISO Recorder\ImapiHelper.exe
O23 - Service: InCD Helper (InCDsrv) - Nero AG - C:\Program Files\Ahead\InCD\InCDsrv.exe
O23 - Service: Norton AntiVirus Auto Protect Service (navapsvc) - Symantec Corporation - C:\Program Files\Norton AntiVirus\navapsvc.exe
O23 - Service: SAVScan - Symantec Corporation - C:\Program Files\Norton AntiVirus\SAVScan.exe
O23 - Service: ScriptBlocking Service (SBService) - Symantec Corporation - C:\PROGRA~1\COMMON~1\SYMANT~1\SCRIPT~1\SBServ.exe
O23 - Service: Symantec Network Drivers Service (SNDSrvc) - Symantec Corporation - C:\Program Files\Common Files\Symantec Shared\SNDSrvc.exe
O23 - Service: VET Message Service (VETMSGNT) - CA, Inc. - C:\Program Files\CA\eTrust Internet Security Suite\eTrust EZ Antivirus\VetMsg.exe
O23 - Service: TrueVector Internet Monitor (vsmon) - Zone Labs, LLC - C:\WINDOWS\system32\ZoneLabs\vsmon.exe
O23 - Service: WAN Miniport (ATW) Service (WANMiniportService) - America Online, Inc. - C:\WINDOWS\wanmpsvc.exe