Try advice below. Won't cure scanner probs but should prevent restarts.
When you are running Windows XP, you may have noticed that every so often (rarely) that Windows reboots without you asking it to. This tends to be caused by a Blue Screen error. If you want to see what this error is, you will have to check the error log list because Windows reboots too quickly for you to read what happened. Well with this tip you can disable the Auto-Reboot so you can finally read, and see the blue screen error.
Go to Start -> Control Panel -> System
Go to Advanced
Under the Startup and Recovery section, click Settings...
Under System Failure un-check "Automatically restart"
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