VIRUS =@

A chaque fois que j'ouvre une page internet, ce n'est pas la page que j'ai demandé qui s'ouvre mais une page vierge avec ecrit:

Insecure Internet activity. Threat of virus attack
Due to insecure Internet browsing your PC can easily get infected with viruses, worms and trojans without your knowledge, and that can lead to system slowdown, freezes and crashes.
Also insecure Internet activity can result in revealing your personal information.
To get full advanced real-time protection for PC and Internet activity, download IE Antivirus.
We recommend you to protect your PC now and continue safe Internet browsing.

j'en ai vraiment marre,j'ai vraiment besoin d'aide =''''( merci d'avance