Computer freezes during boot-up and in Windows

Hello,

So I'm trying to fix my dads computer. It had a bunch of spyware/viruses/etc, I think I got rid of most of them with a combination of spybot, combofix and windows antivirus.

When I try to boot up, it regularly freezes during the Windows XP boot screen. I can usually get safe mode to load but it will occasionally freeze in safe mode and require me to hold the power button to turn it off.

HP Pavilion 750n
Windows XP

Thank you.
 
Can you re-install XP fresh? MS's support will stop April 14 so no more updates will be available for XP then
 
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