requesting/question: is there an offline spyware scanner or portable one?

I mistakenly made a booboo on a file I should never have opened. I'm questioning the stability of this install as getting weird opened programs (eg. winrar has 4 processes -- and several weird errors after opening archives).

I HAVE tested the system with avg, spybot and adaware, but call me paranoid but I still don't trust things. I'm going to download clamav, and maybee run in a preinstall enviroment to make sure but I wanted to know if anybody is working on, knew of, can recommend something that doesn't need install, is being developped by someone for portableapps.com, or works in pe without prior fiddling?

please help!