My computer has started to shut down and reboot when I am in the middle of
Something. What is causing this and how can I fix it? I am running Windows XP.
Thank you

You can do a repair installation

Repair Installation
A Repair Install will replace the system files with the files on the XP CD used for the Repair Install. It will leave your applications and settings intact, but Windows updates will need to be reapplied.

A Repair Install will replace files altered by adware and malware, but will not fix an adware, malware problem.

Code:

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http://www.microsoft.com/windowsxp/using/helpandsupport/learnmore/tips/doug92.mspx

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For me, it's always been heat related, my computer needed to be cleaned out, and that always fixed it for me.

No more answers for Snowbird (jots a note).

As what title states, as opposed to a re-installation, this is a repair installation

A Repair Install will replace the system files with the files on the XP CD used for the Repair Install. It will leave your applications and settings intact