PC crash after restart

[zahorsky]

Hello, after downgrading my AVG antivirus to the free version I restarted. After restarting my PC will no longer load windows 7. After "Launch startup repair (recommended) kicks in it goes to a loading screen. After that it goes black then after a short pause I get a blue screen that says: STOP: c000021a (FAatal System Error) and basically says that the system has been shut down. I can get to my FOXCONN motherboard setup but cannot get to safe mode. F8 doesn't work and my usb keyboard doesn't have power during the boot screen so I cannot choose the option "start windows normally" to see what happens. PLEASE HELP

 

[zahorsky]

it's 64 bit windows btw