actually thanks patio : ).
I finally managed to open safe mode (i couldnt do it by tapping f8, i had to run MSCONFIG) and then i used AVG on safe mode and it seemed to have found a lot of viruses. it got rid of it, and most of my files were infected.
funny enough i had this one file on my computer called KILLAPPLICATIONS.exe, scared me : P.
anyway, i removed it on safemode, then reformated and the problem is gone now. thanks for all the help everyone.