Virus causing my computer to enter standby

Hello,

I have a huge problem with my computer at home. My son was on facebook playing one of the games and he clicked on a gift. Something popped up (he doesn't remember what) and now my computer is doing crazy things. First the keyboard locked up...then we restarted and before any of the bios stuff or loading windows a screen popped up covered in symbols like smiley faces and hearts. Then everything started loading and the computer immediately entered standby mode.

I restarted in safe mode and ran avg and malware bytes, they found nothing. Do you have any suggestions?

Thanks for your time,
summrgrl90