When you rebooted after the bluescreen, WinXP should have given you the option to submit the crash dump file to Microsoft for free analysis. See http://oca.microsoft.com/ for details. If you provide your email address, you'll get an email reply with the results of the analysis. This is an easy way to find out if your crash is due to a well-known problem.

I see you have a GeForce3. Since WinXP shipped last year, newer drivers for this device have been released to fix a few problems. You can find them at http://windowsupdate.com/ and at the NVIDIA website. I don't remember if these include a fix for a Stop 0xA bluescreen, but I recommend the newer drivers.

Good luck
Vince