Hi all. It's been a while since being here, so i really want to say that i managed to save all of my files. This subject is now old, but if enyone has anything similar, this might help...
I now know what gone terribly wrong - after a boot-time scan my win profile was sc***** up. Windows 7 gives message "you have been logged on a temporary profile", which means that i hadn't be able to access anything at my profile. At that time i was thinking that not all of my data is missing, but after i was find out that i was wrong. Thing that really scared me at that time is that when i tried to login into safe mode, it had exact same message.
System recovery and logging in onto last good known conf. didn't hellped, so i tried this
http://support.microsoft.com/kb/947215, and after that i was able to access into safe mode (at my profile, which is one and only to the comp), and move all of the data to one partition. After that system is installed again.
Later i find out that the fu***** thing that i wanted to start boot-time scan was one of the viruses that someone previosly mentioded - auto runn virus that is hidding some of the folders, in my case, some of the folders in program files x86, something like total commander, pdf creator, daemon as far as i can remember - stupid virus which don't really require an antivirus!!!
Now it all works, and this machine won't see avast anymore.
Once again thanks all you guys for trying to help me, and sorry once again for a late answer...
seeyaa