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Change motherboards without reinstalling XP

Before you change the motherboard in device manager change the IDE ATA/ATAPI controllers to "Standard Dual Channel PCI IDE Controller". You do this by going to update driver and then selecting "Don't Search. I will choose the driver to install." Then select the "Standard….Controller."  After you have changed the controller, shut down the PC and change the motherboard. You should now be able to boot without the blue screen. Now load the new motherboard drivers including the new IDE controller driver. This is useful for people who use removable drives or people who need to upgrade their motherboard

Remove unneeded DLLs from memory

At times XP keeps DLLs in cache memory even when the program that required them is no longer running and this cuts down on the memory available to other applications.

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer

Create a new DWORD value named AlwaysUnloadDll, and give it a data value of 1. Exit the Registry and reboot for the new setting to take effect. Note that this setting may cause problems with some programs. Some Windows programs—especially older and 16-bit programs—may issue error messages with this setting in effect; so if that starts happening, delete the new key or give it a value of 0.