Thank you guys so much for all replies and your help, I really appreciate everything!
Unfortunately I haven't noticed my friend's (essexboy) reply with the link for that little tool, and I already restored one of my old system images that had no infected files inside... totally clean.
avast! boot scan started to full around saying it is unable to repair some files, so I gave up and went with restoring one of my old system images.
Problem is solved, I just wish I've noticed that post on time, so at least I could have given it a try and see what happens. Anyway, this is the situation and I had a lot of extra application to reinstall, but at least it's 100% clean now.
Thanks again people, I appreciate your assistance !