I have been tracking this for several weeks and it appears that svchost.exe over about a 12 hour period is using up available non paged memory and causing the system to not respond and needs to be rebooted. Have run several anti-virus checks and spyware removals, but problem still exists. Here is a copy of hijack this and many thanks to anyone who can offer assistance.
P.S. Please keep responses to a newbie level. (i.e. step-by-step) thanks

Logfile of HijackThis v1.99.1
Scan saved at 4:23:34 PM, on 12/5/2005
Platform: Windows XP SP2 (WinNT 5.01.2600)
MSIE: Internet Explorer v6.00 SP2 (6.00.2900.2180)

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\Ati2evxx.exe
C:\WINDOWS\system32\svchost.exe
C:\WINDOWS\System32\svchost.exe
C:\WINDOWS\system32\spoolsv.exe
C:\WINDOWS\system32\Ati2evxx.exe
C:\WINDOWS\Explorer.EXE
C:\PROGRA~1\TRENDM~1\INTERN~1\PcCtlCom.exe
C:\Program Files\Java\jre1.5.0_04\bin\jusched.exe
C:\Program Files\Common Files\Real\Update_OB\realsched.exe
C:\WINDOWS\System32\svchost.exe
C:\WINDOWS\system32\spool\drivers\w32x86\3\hpztsb10.exe
C:\Program Files\HP\hpcoretech\hpcmpmgr.exe
C:\Program Files\Multimedia keyboard utility\1.3\KbdAp32A.exe
C:\Program Files\Trend Micro\Internet Security 2005\pccguide.exe
C:\PROGRA~1\TRENDM~1\INTERN~1\Tmntsrv.exe
C:\Program Files\ATI Technologies\ATI Control Panel\atiptaxx.exe
C:\PROGRA~1\TRENDM~1\INTERN~1\tmproxy.exe
C:\WINDOWS\system32\svchost.exe
C:\WINDOWS\system32\fxssvc.exe
C:\PROGRA~1\TRENDM~1\INTERN~1\TmPfw.exe
C:\Program Files\Outlook Express\msimn.exe
C:\Program Files\Internet Explorer\iexplore.exe
C:\Documents and Settings\Steve\Desktop\Hijackthis\HijackThis.exe

R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = http://www.adelphia.net/
O2 - BHO: AcroIEHlprObj Class - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - C:\Program Files\Adobe\Acrobat 7.0\ActiveX\AcroIEHelper.dll
O2 - BHO: Google Toolbar Helper - {AA58ED58-01DD-4d91-8333-CF10577473F7} - c:\program files\google\googletoolbar2.dll
O3 - Toolbar: &Google - {2318C2B1-4965-11d4-9B18-009027A5CD4F} - c:\program files\google\googletoolbar2.dll
O4 - HKLM\..\Run: [SystemTray] SysTray.Exe
O4 - HKLM\..\Run: [InstantAccess] C:\PROGRA~1\TEXTBR~1.0\BIN\INSTAN~1.EXE /h
O4 - HKLM\..\Run: [SunJavaUpdateSched] C:\Program Files\Java\jre1.5.0_04\bin\jusched.exe
O4 - HKLM\..\Run: [REGSHAVE] C:\Program Files\REGSHAVE\REGSHAVE.EXE /AUTORUN
O4 - HKLM\..\Run: [QuickFinder Scheduler] c:\Corel\Office7\Shared\QFinder7\QFSCHED.EXE
O4 - HKLM\..\Run: [TkBellExe] "C:\Program Files\Common Files\Real\Update_OB\realsched.exe" -osboot
O4 - HKLM\..\Run: [ISUSPM Startup] C:\PROGRA~1\COMMON~1\INSTAL~1\UPDATE~1\ISUSPM.exe -startup
O4 - HKLM\..\Run: [FLMK08KB] C:\Program Files\Multimedia keyboard utility\1.3\MMKEYBD.EXE
O4 - HKLM\..\Run: [HPDJ Taskbar Utility] C:\WINDOWS\system32\spool\drivers\w32x86\3\hpztsb10.exe
O4 - HKLM\..\Run: [HP Component Manager] "C:\Program Files\HP\hpcoretech\hpcmpmgr.exe"
O4 - HKLM\..\Run: [NeroFilterCheck] C:\WINDOWS\system32\NeroCheck.exe
O4 - HKLM\..\Run: [pccguide.exe] "C:\Program Files\Trend Micro\Internet Security 2005\pccguide.exe"
O4 - HKLM\..\Run: [ISUSScheduler] "C:\Program Files\Common Files\InstallShield\UpdateService\issch.exe" -start
O4 - HKLM\..\Run: [ATIPTA] C:\Program Files\ATI Technologies\ATI Control Panel\atiptaxx.exe
O4 - HKCU\..\Run: [SpybotSD TeaTimer] C:\Program Files\Spybot - Search & Destroy\TeaTimer.exe
O4 - Global Startup: Adobe Gamma Loader.lnk = C:\Program Files\Common Files\Adobe\Calibration\Adobe Gamma Loader.exe
O4 - Global Startup: Adobe Reader Speed Launch.lnk = C:\Program Files\Adobe\Acrobat 7.0\Reader\reader_sl.exe
O4 - Global Startup: Microsoft Office.lnk = C:\Program Files\Microsoft Office\Office\OSA9.EXE
O9 - Extra button: (no name) - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\Program Files\Java\jre1.5.0_04\bin\npjpi150_04.dll
O9 - Extra 'Tools' menuitem: Sun Java Console - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\Program Files\Java\jre1.5.0_04\bin\npjpi150_04.dll
O9 - Extra button: Messenger - {FB5F1910-F110-11d2-BB9E-00C04F795683} - C:\Program Files\Messenger\msmsgs.exe
O9 - Extra 'Tools' menuitem: Windows Messenger - {FB5F1910-F110-11d2-BB9E-00C04F795683} - C:\Program Files\Messenger\msmsgs.exe
O15 - Trusted Zone: http://www.woot.com
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/viewers/ipixx.cab
O16 - DPF: {17492023-C23A-453E-A040-C7C580BBF700} (Windows Genuine Advantage Validation Tool) - http://go.microsoft.com/fwlink/?linkid=39204
O16 - DPF: {41F17733-B041-4099-A042-B518BB6A408C} - http://a1540.g.akamai.net/7/1540/52/...eInstaller.exe
O16 - DPF: {6E32070A-766D-4EE6-879C-DC1FA91D2FC3} (MUWebControl Class) - http://update.microsoft.com/microsof...?1129042044134
O16 - DPF: {A1337CC4-FF8E-11D1-9C48-00A0CC20E0D0} (EZListings) - http://www.therealyellowpageslive.net/live/ezlistng.cab
O16 - DPF: {A1337CC4-FF8E-11D1-9C48-00A0CC20E0D2} - http://www.therealyellowpageslive.net/live/ezinit.cab
O16 - DPF: {D1ACD2D8-7312-4D06-BECD-90EB094D2277} - http://mediaplayer.walmart.com/installer/install.cab
O16 - DPF: {EB387D2F-E27B-4D36-979E-847D1036C65D} (QDiagHUpdateObj Class) - http://h30043.www3.hp.com/hpdj/en/check/qdiagh.cab?316
O16 - DPF: {F7A05BAC-9778-410A-9CDE-BFBD4D5D2B7F} (iPIX Media Send Class) - http://216.249.24.60/code/iPIX-ImageWell-ipix.cab
O17 - HKLM\System\CCS\Services\Tcpip\..\{4EAB7B2D-ED18-419D-9B00-4B60B61C5F3E}: NameServer = 68.168.192.5,68.168.192.2
O17 - HKLM\System\CS1\Services\Tcpip\..\{4EAB7B2D-ED18-419D-9B00-4B60B61C5F3E}: NameServer = 68.168.192.5,68.168.192.2
O23 - Service: Ati HotKey Poller - Unknown owner - C:\WINDOWS\system32\Ati2evxx.exe
O23 - Service: ATI Smart - Unknown owner - C:\WINDOWS\SYSTEM32\ati2sgag.exe
O23 - Service: Trend Micro Central Control Component (PcCtlCom) - Trend Micro Incorporated. - C:\PROGRA~1\TRENDM~1\INTERN~1\PcCtlCom.exe
O23 - Service: Trend Micro Real-time Service (Tmntsrv) - Trend Micro Incorporated. - C:\PROGRA~1\TRENDM~1\INTERN~1\Tmntsrv.exe
O23 - Service: Trend Micro Personal Firewall (TmPfw) - Trend Micro Inc. - C:\PROGRA~1\TRENDM~1\INTERN~1\TmPfw.exe
O23 - Service: Trend Micro Proxy Service (tmproxy) - Trend Micro Inc. - C:\PROGRA~1\TRENDM~1\INTERN~1\tmproxy.exe