Dude, how do you manage to get all these viruses? My AV (MS Security Essentials) detected the obfuscator.xz, I remeved it from the PC, rescanned and all was clear.
And since I was in doubt whether this program is a problem, I'd like to thank Borg 386, Jacee and SchwarzTee for the awesome advice provided in the topic.
It's maybe a good idea to make back-ups every week and just reload earlier version if something like that happens.