Download CWShredder from here and run it. Select the fix button & it will fix everything related to CoolWebSearch that is stored in it's database. Close ALL windows, including Internet Explorer, 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.
Scan with hijackthis and tick the boxes next to all the following entries, then close all browser and explorer windows, and hit the "Fix checked" button.
R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = http://www.searchportal.info/10010/
R0 - HKLM\Software\Microsoft\Internet Explorer\Search,SearchAssistant =
F3 - REG:win.ini: run=C:\WINDOWS\inetdim\winlogon.exe
O2 - BHO: (no name) - {5321E378-FFAD-4999-8C62-03CA8155F0B3} - (no file)
O4 - HKLM\..\Run: [72204cac3e9d] C:\WINDOWS\System32\adsnt139.exe
O4 - HKLM\..\Run: [dpmocc] C:\WINDOWS\System32\dpmocc.exe
O4 - HKLM\..\Run: [4c9effea1be8] C:\WINDOWS\System32\appmgr30.exe
O4 - HKLM\..\Run: [xp_system] C:\WINDOWS\inetdim\winlogon.exe
O4 - HKCU\..\Run: [eZWO] C:\PROGRA~1\Web Offer\wo.exe
O4 - HKCU\..\Run: [xp_system] C:\WINDOWS\inetdim\winlogon.exe
Reboot into safe mode following the instructions here and navigate to and delete the following if found:
C:\WINDOWS\inetdim<----folder
C:\PROGRA~1\Web Offer<-folder
C:\WINDOWS\System32\adsnt139.exe<----file
C:\WINDOWS\System32\dpmocc.exe<----file
C:\WINDOWS\System32\appmgr30.exe<----file
Reboot normally after doing this & post another log please.