Hello,
Newbie here. I have an XP problem and noticed many of you give good advice.

XP has this problem with crashing/restarting within 20 minutes of turning the computer on everyday. After that, there are no more problems at all the rest of the day. I checked the Application Event Viewer and something I found that could possibly be related is this warning before EVERY shutdown:

"Windows saved the user's registry while an application or service was still using the registry during log off. The memory used by the user's registry has not been freed. The registry will be unloaded when it is no longer in use.

This is often caused by services running as a user account, try configuring the services to run in either the LocalService or NetworkService account".

I'll check for any other errors too.
Any suggestions?

according to this http://www.jsiinc.com/SUBM/tip6100/rh6113.htm that is not your problem

when the computer crash. does it give you a blue screen or is just restarting ?

Sounds to me like a driver conflict.

Ya have to set XP to stop on a blue screen, otherwise by default, it reboots.

I just got some more information about the error from the blue screen. It reads:
PFN_List_Corrupt
Stop: 0x0000004e ( , , , )

Where can I find a good resource for troubleshooting?

Bug Check 0x4E: PFN_LIST_CORRUPT
The PFN_LIST_CORRUPT bug check has a value of 0x0000004E. This indicates that the page frame number (PFN) list is corrupt.


CAUSE
This behavior occurs because a driver or other problem damaged the input/output (I/O) driver structures.

If you receive this error message randomly, or when you try to start a program, remove extra memory or have the random access memory (RAM) in your computer tested. This behavior may occur if you have bad RAM.