On the previous link that I gave you this variant did not have a manual removal, here it is! This is probably what you have on your PC.
Manual removal for CoolWebSearch.qttasks:
Please follow the instructions below if you would like to remove CoolWebSearch.qttasks manually.
Please notice that you must follow the instructions very carefully and delete everything that is mentioned. In most cases the removal will fail if one single item is not deleted. If CoolWebSearch.qttasks remains on your system after stepping through the removal instructions, please double-check by stepping through them again.
Start the registry editor. This is done by clicking Start then Run. (The Run dialog will appear.) Type regedit and click OK. (The registry editor will open.)
Browse to the key:
'HKEY_CURRENT_USER \ SOFTWARE \ Microsoft \ Windows \ CurrentVersion \ Run'
In the right pane, delete the value called 'QuickTime Task', if it exists.
Exit the registry editor.
Restart your computer.
Start Windows Explorer and delete:
%WinDir%\qttasks.exe
Note: %WinDir% is a variable (?). By default, this is C:\Windows (Windows 95/98/Me/XP) or C:\WINNT (Windows NT/2000).
Start Microsoft Internet Explorer.
In Internet Explorer, click Tools -> Internet Options.
Click the Programs tab -> Reset Web Settings