Fixing errors preventing XP from booting

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These instructions are for fixing errors that prevent Windows XP from booting.  Specifically, errors like "Windows could not start because the below file is missing or corrupt: C:\Windows\System32\Ntoskrnl.exe" and
"Windows could not start because the following file is missing or corrupt: C:\windows\system32\config\system"

This is not for errors when your computer does not start.  I will hopefully create a page for that soon, but in the meantime, please go to an online tech support forum.

If you have the  Ntoskrnl.exe error, please follow the instructions here.

If you have the config\system error, please follow the instructions here. (sorry, these instructions are incomplete)

If you have both, or suspect a corrupt file system and/or bad hard drive sectors, please follow the instructions here.