what i'd do is go to a computer geek like forum or something. and ask them, they'll probably tell you to get the program "hijack this" (its downloadable) this will generate a log of processes and operations on your comp and post that and your problem and what not and they should help. press "ctrl alt del" and se eif theres any suspicious things running and do a search on google for the *.exe or wtvr. this should help figure something out or take you to one of the said forums