AVG causing system reboot during scan.

I have a Compaq running XP SP2 (currently unable to update, working with MS on this issue), and when I attempt a scan with AVG, it gets to the same place each time, near the beginning of the scan in the registry, and the system reboots.  After reboot, a message comes up indicating there was a fatal error and prompts me to send the report to MS.  When I do, it comes back stating there was a Blue Screen and give me three things to try, updating drivers, virus scan, and chkdsk.  I am able to run the AVG scan in safe mode, and a chkdsk gave up no errors.  I have not tried the drivers yet, but wanted to get some feedback on this since sometimes updating drivers can cause other issues.  May posts point to heat issues, but since I am able to run the scan in safe mode, and I have been able to do defrags and other disk and cpu intensive items without issue, I think it is isolated to AVG.  My system is a Compaq Presario S6500NX.  Thanks.