Registry Comparison Tools

Regshot is an open-source registry compare utility that allows you to quickly take a snapshot of your registry and then compare it with a second one - done after doing system changes or installing a new software product. Regshot is compatible with Windows 7 (both 32-bit & 64-bit). I also tried another nice tool called Advanced Registry Tracer 2.01 which does the same job but was not updated to work on Windows 7.