Damage to the operating system. As it stands there is not enough information in your post as who you need to call to fix this.
Bob
For last 1 week wn i am opening my computer. 1 dialog box will come and it will be" you may be victim of software counterfeiting". and sometime telling ur computer might be at risk, and some time telling 'ask for genuine windows software". i dont have any idea where this problem comes. please help me.

Chowhound
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GameFAQs
GameSpot
Giant Bomb
TechRepublic