You can use free downloads: Belarc Advisor, Everest, or CPU-Z / CPUID to run an inventory of your computer, in order to start the fix. It is usually a Windows 2000 error, and is rare in WXP. Which OS do you have? It is usually a driver error, but figgering out where is difficult.
From Microsoft:
How to Troubleshoot a "STOP: 0x0000004E PFN_LIST_CORRUPT" Error
Article ID : 291806 Last Review : May 30, 2007
Revision : 4.2
This article was previously published under Q291806
SYMPTOMS
When you use a Windows 2000-based computer, you may receive the following error message on a blue screen:
STOP: 0x0000004E PFN_LIST_CORRUPT (Parameter1, Parameter2, Parameter3, Parameter4)
This behavior occurs because a driver or other problem damaged the input/output (I/O) driver structures. To troubleshoot this behavior:
1. Run hardware diagnostic tools that are provided by your computer manufacturer.
2. Disable all file system filter drivers, such as backup utilities, virus scanners, or firewall software.
3. View the following Microsoft Web site to verify that the hardware and the drivers for the hardware are compatible with Windows 2000:
http://www.microsoft.com/whdc/hcl/default.mspx (
http://www.microsoft.com/whdc/hcl/default.mspx)
For information about the hardware on your computer, contact the manufacturer.
4. 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.
For more information about the parameters of the PFN_LIST_CORRUPT function, visit the following Microsoft Web site:
http://msdn2.microsoft.com/en-us/library/ms793247.aspx