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New power supply made Windows quit working

I recently replaced the 300W ATX power supply in my PC with a 630W one. The computer turned on and seemed to work fine but Windows XP quit working. Windows just quits doing anything before loading completely leaving it unable to do anything (both XP/98 and safe/normal modes). Something odd is that my processor speed is now shown as 1.7GHz instead of 2.23GHz in the BIOS. I've tried to reset the BIOS and reinstall Windows and neither does anything. Something else that is strange is that I've installed Ubuntu Linux and it works fine (?) . Is there anything I can do? Is it possible that my hardware has been fried and Windows just won't work on this PC anymore?

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(NT) How old is the CMOS battery ?

In reply to: New power supply made Windows quit working

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Battery seems to be fine

In reply to: How old is the CMOS battery ?

The battery is as old as the board but I don't think this is the problem since the BIOS reset when I moved it.

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Master Boot Record (MBR)

In reply to: New power supply made Windows quit working

When you put in a new power supply theres a lot of stuff you got to unplug, jingling things around, possibly damaging something. Either breaking something or shocking something with a static discharge.

If you boot off your CD with windows XP you should try repairing the master boot record with the repair option windows install has.

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Windows is dead

In reply to: Master Boot Record (MBR)

Thats part of the problem, the Windows disks don't work. They freeze just like windows itself does.

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