PC keeps freezing up

Windows XP Media Center Edition 2005

Machine locks up after it has been in sleep mode(hibernation)? The past 3 days I find my machine locked up in the mornings or after I have been away for a few hours. Screen appears normal but mouse is frozen and nothing works. Restart fixes it each time.

AVG Free 2013 finds nothing

Malwarebytes finds nothing

I know it's time for a new system but need to wait a but still.

Thanks,

Larry

via Bleeping Computer Last 20 Posts http://www.bleepingcomputer.com/forums/t/513258/pc-keeps-freezing-up/