Download CWShredder from here & run it. Select the fix button & it will get rid of everything related to CoolWebSearch that is stored in it's database. Close ALL windows, including IE, before running CWShredder. Reboot.
To help prevent this from happening again, install the patches for the vulnerabilities that this hijacker exploits by going here for your critical updates.
Unzip HJT into it's own permanent folder before doing anything in order for it to create backups. (Not a temporary folder or directly on the desktop & not directly on your hard drive). Close all (browser) windows & rescan with hijackthis. When the scan is finished place a check in the box to the left of the following entries & click 'fix checked' :
R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Search Bar = file://C:\WINDOWS\System32\SearchBar.htm
R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Search Page = res://C:\WINDOWS\system32\ropnc.dll/sp.html#96676
R0 - HKLM\Software\Microsoft\Internet Explorer\Main,Start Page = res://ropnc.dll/index.html#96676
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Search Bar = http://red.clientapps.yahoo.com/cus...rch/search.html
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Search Page = res://C:\WINDOWS\system32\ropnc.dll/sp.html#96676
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Page_URL = res://ropnc.dll/index.html#96676
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Search_URL = res://C:\WINDOWS\system32\ropnc.dll/sp.html#96676
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName =
F0 - system.ini: Shell=
O2 - BHO: (no name) - {F74B10DD-C3BA-1643-F8BA-F818F5131A48} - C:\WINDOWS\system32\mfcaf32.dll
O4 - HKLM\..\Run: [syswq32.exe] C:\WINDOWS\system32\syswq32.exe
O4 - HKLM\..\Run: [56Y#Y@H2EL5FTC] C:\WINDOWS\System32\UgmSN8q.exe
O16 - DPF: {1D4DB7D2-6EC9-47A3-BD87-1E41684E07BB} - http://ak.imgfarm.com/images/nocach...etup1.0.0.6.cab
O16 - DPF: {D9EC0A76-03BF-11D4-A509-0090270F86E3} - http://cdn2.adsdk.com/bannerfarm/47...r1132031209.EXE
Reboot into safe mode following the instructions here & navigate to & delete the following if found:
C:\WINDOWS\system32\syswq32.exe< file
C:\WINDOWS\System32\UgmSN8q.exe< file
C:\WINDOWS\system32\ropnc.dll< file
In order to view these files you may have to select 'show hidden files/folders.' Instructions on how to here.
Reboot after doing this & post another log please.