lol dont you love computers...
ok this isnt it exeactly but read this:
weird: After you install Microsoft Windows XP, you cannot successfully start Windows XP. When you try to start Windows XP, you receive the following error message on a blue screen:
Stop - c0000415 : " unknown hard error"
This issue may occur if you have an ATI Radeon 7200 series display adapter installed on your computer. The drivers that are supplied with this adapter may not work correctly with Windows XP