[quote=---xXirukiTepe---]my friend says, that i should reformat my pc.... is it a solution?

[/quote]
yes formatting it will be the easiest soution but on my personal opinion it can be fixed easily. if you want me to help you, download hijackthis from the link below:
[quote]
http://www.spywareinfo.com/~merijn/programs.php#hijackthis[/quote]
scan your pc with that utility software and post the logs here so that i can help you identify/remove the spyware the causes ur problem.