Save the Registry in order to analyze changes.
Advanced Registry Tracer is a utility designed for analyzing changes made to the Windows Registry. It does this by making ‘snapshots’ of the Registry and saving them in its database, which you can later browse through at your convenience. You can compare any two snapshots and get a list of keys and data which are new, deleted or modified. ART can compare the entire Registry or any key of the Registry. It can also exclude keys of the Registry from comparison results. With ART you can create undo/redo files (to rollback changes, for example). To view the current state of a key or to modify it, you can use ART’s Jump to Regedit function. The contents of any key can be exported to a standard .reg file (either new or old format).
Advanced Registry Tracer is very useful for detecting Trojan viruses and eliminating problems caused by software and hardware installs and uninstalls.
ART compares full copies of the Registry that were made at different times, allowing you to track (and undo!) each and every change to the Registry without affecting your system performance.
ART lets you create filters so you can very easily compare specific keys. In this way you can safely experiment with registry tweaks that are normally represented as REG files and also create your own tweak data base!
Note: trial version has some limitations
For Windows 95/ 98/ Me/ NT 4.0/ 2000 and XP.