Airnav,
I have just returned to my PC tonight and found that windows has done its usual thursday night trick of restarting my PC after updating.
Very Frustrating.
I hate the way Microsoft think they can do whatever they like to your PC.
Here's the fix for XP SP3. It lets you reboot when YOU want (after you have closed any running apps etc) Not at Microsoft's whim in the middle of the night.
http://support.microsoft.com/kb/555444