hayho,

I have the following PROBLEM: there's something on my computer that definitely shouldn't be there. I'm currently not using any antivurussoftware. since this Morning, i'm permanently getting alerts from windows: "infiltration alert: your computer is being attacked by an internet virus. it could be a password-stealing attack, a trojan - dropper or similar ... do you WANT to block this attack?" if I CLICK "yes" I'm just transferred to a WEBSITE where I can buy Antivirus Soft.
also there's a window opening "application cannot be executed. the FILE ... is infected. do you want to activate your antivirus software now?" which averts the running of any programm [anything I try to open will not work, and I am not able to install anything.]
besides, my Internet Explorer [usually I use Firefox] is opening porn sites like *adult URL* independently.
what's going on there and what can I do against it?
in hope for fast help, [sorry for my bad English, I'm German],

the princessPlease visit this webpage for a tutorial on downloading and running ComboFix:

http://www.bleepingcomputer.com/combofix/how-to-use-combofix

See the area: Using ComboFix, and when done, post the log back here.