You can download TDSSKiller and follow guide to use the tool:
Hey ya'll. I'm trying to remove Backdoor.Tidserv (as Symantec calls it).
I've run Malwarebytes, A squared Free, HijackThis, Norton Power Eraser, TrendMicro Rootkit Buster, and Norton Internet Security countless times, but I still get notifications saying that while using internet explorer, I'm being attacked (as well as the fact pages are redirected).
This is on a x86 Windows XP Computer.
I've run all of the full scans in safe mode, disabled System Restore, and went through countless folders looking for files which look to be the virus, with no luck.
I'd appreciate any help you may have to offer me.