system
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I’m sorry I was a little cranky, but after spending many hours trying to fix this “virus” and then finding out it’s probably just a false positive… >:(
But thanks for trying to help. 
I run win xp pro sp1 fully updated, I have tried online scans (RAV, trend and panda) with and without avast disabled, and the file that’s “infected” is …\Program Files\Serv-U\serv-u32.exe.
Avast reacts to this file when it’s not running, and when it’s running. To get serv-u up I have to disable avast, and as soon as I enable avast serv-u is shut down.
I can’t seem to find an option in avast to ignore this specific file.
It would be helpful if avast made a list of the false positives, since it seems like there is a lot of them… 