My polish is bad but i think the translation is "Infector is concealed, version 2.10". Quite communicative for a virus, but yes you should get rid of this asap
Do you always log in with your administrator account? Do you have Flashplayer installed? Using an old version of Internet Explorer? ActiveX enabled in Internet Explorer? All this things, especially in combination, make your computer vulnerable to virus infection, even if you only visit trusted sites.