Virus detected at startup

Hello,
I have just installed linux and every thing went very well. But when I reboot, there was in the back, something that asks me if I want Linux, Windows, Fail .. or floppy. When I type windows or linux or others, I live after a red screen that tells me that a virus has been detected. Can any one help me with this. Any help regarding this topic is appreciated. Thanks in advance.
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