Trojan a detruire

Bonjour,

une page sur fond rouge apparait et m'empeche de faire des recherches sur goosle ou sur mes pages ...

Warning! Visiting this site may harm your computer!
This web site probably contains malicious software program, which can cause damage to your computer or perform actions without your permission. Your computer may be infected after visiting such web site.

We recommend you to install (or activate) antivirus security software.

I do realize that visiting this site can cause harm to my computer.

j ai telecharger spybot mais un trojan reste :

Pouvez vous m'aider merci