S nejvetsi pravdepodobnosti jde o virus. Takze vycistit! Mimo standardni "odbreberkovavace" (napr. SpyBot Search and Destroy, Nod32, Spyware Terminator) pouzij i Hijackthis
Az bude cisto, tak prevence:
http://pc.poradna.net/article/view/600-bezpecnost-n a-internetu-pracujeme-s-neprivilegovanym-uctem-i
http://pc.poradna.net/article/view/714-bezpecnost-n a-internetu-pracujeme-s-neprivilegovanym-uctem-ii