幫我返翼左佢 thx
couple possibilities :
1. there is some loosen hardware connection in the motherboard, check the RAM installation first.
2. BIOS or OC setting problems.
3. Windows installation problem on ADVANCED POWER MANAGEMENT ...
I recommend you to check the above, and reinstall Windows XP from scratch and see if it helps, I don't think it is HARD DRIVE related or Virus related.
But make sure your antivirus is up-to-date and not a privated copy.
good luck