Hi Bryan
As I'm sure everyone will agree
Before making any hardware changes you should always back-up any important
files or
data and note any important settings.
XP configures itself to suit the hardware on installation, so after a major
hardware change such as the one you describe you must re-configure XP to
suit the new hardware.
**** If you have a retail XP install CD - ****
Many users, myself included, prefer to do a full clean install after major
hardware changes as you describe.
The alternative, and equally valid option, is the repair install (also known
as an In-Place Upgrade)
See following Knowledge Base article for details.
How to Perform an In-Place Upgrade (Reinstallation) of Windows XP
http://support.microsoft.com/default.aspx?scid=KB;EN-US;Q315341&ID=KB;EN-US;Q315341
After doing this you may need to re-activate your installation of XP. If it
has been more than 120 days since you last re-activated you should be able
to activate over the internet, otherwise it will require a short phonecall.
After the repair install you will need to re-install any XP service packs
and updates, but you will not need to re-install any applications.
Hope that helps
Pete