My windows keeps restarting itself.I think may be a virus but can't say for sure. Can
Someone help out.. thanks

Can you boot to Safe mode? What version of Windows? Do you have an a/v program?

Check For hardware issues an if there is a virus I hope you backed everything up. If you did'nt find a tech friend to use his computer to allow you to remove all the file and apps from the drive an reinstall the OS

I'm not an expert but sharing my experience. I was facing problem that my computer goes off suddenly & when I restart as soon as the XP's first screen comes it restarts and continuousely do that. I reinstalled windows twice but still same. Later found that computer's power supply was destroying motherboard & within two weeks there was no display. You better check your power source if you're using any stabilizer / voltage transformer device or your electric voltages are okay!

my windows keeps restarting itself.i think may be a virus but can't say for sure. can
someone help out..thanks
Check if system goes in safe mode means try with chkdsk /f c: