Hi. First of all you need to update hijackthis to version 1.98.2. Run hijackthis & go to *Config\Misc Tools\Check for update on-line*. If the site is down, go here. Remove the old version by deleting the file manually. Unzip the new version into the hijackthis folder.
Click My Computer, then C:\
In the menu bar, File->New->Folder.
That will create a folder named New Folder, which you can rename to "HJT" or "HijackThis". Now you have C:\HJT\ folder. Put your HijackThis.exe there, and double click to run it.
Uninstall WebHancer from add/remove programs.
Enable everything in Msconfig & reboot before scanning again with hijackthis. We need to see what is there :).
Download CWShredder from here & run it. Select the fix button & it will fix everything related to CoolWebSearch that is stored in it's database. Close ALL windows, including Iinternet 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.
Reboot after doing this & post another log please.