RegSnap is a tool that can help you to analyze changes made to the Windows Registry. With it, you can compare saved snapshots and learn which keys have been modified, deleted, or added. You can also analyze other sensitive system parts, such as a list of files in Windows, Windows System directories, Program Files and My Documents, win.ini and system.ini files, autoexec.bat and config.sys files. RegSnap generates HTML reports and .REG files to undo and redo registry changes. Pro version supports command line interface and OLE Automation (i.e. could be scriptable from your programs).
30-day trial version is available for download. After 30 day trial period you must either stop using RegSnap or register it.

RegSnap Standard vs RegSnap Pro
There are two RegSnap versions: Standard and Pro. Standard version is best suitable for home users while Pro version is for corporate users. The following features are available in Pro version only:
Command line mode
OLE Automation support
(i.e. RegSnap Pro is scriptable from Visual Basic or any other Automation client)
Remote registry connection
System requirements:
MFC runtime DLLs (mfc42.DLL & msvcrt42.DLL). Most likely you have already installed these DLLs. Installer will check your system and prompt for download this component if it is missed on your computer.
Windows 95/98/Me or NT 3.51/4.0/2000/XP.
Internet Explorer v4.0 or higher.

Download RegSnap Pro v4.8