I bought spyware doctor to remove detect trojan.proxy.lager.f
http://www.pctools.com/mrc/infection...Proxy.Lager.f/
When i run spyare doctor in windows safe mode 2 or 3 times it apperantly removes the malware.
BUT after using the computer for some hours my computer again has this malware

. And i have always onguard on.
Why can't spyware doctor remove this malware?