I found this in a few different places around the 'net - hopefully it's helpful:
Review Upgrade Report
Are one or more of your programs not working after an upgrade? Are you experiencing hardware issues? Did you forget to completely read the upgrade report during the upgrade to Windows XP? You can still review the upgrade report after Setup is complete.
- Click Start, and then click Run.
- Type upgrade.txt to review the upgrade report.
- This document is stored in C:\WINDOWS.