BDHSoft RegMonitor

Who Changed My Registry? BDHSoft RegMonitor will tell you. RegMonitor is a utility that monitors all Registry activity on a system. It tell you how applications operate the Registry, and it can trace all operations of the Registry, including querykey, createkey, setvalue and so on. You can use RegMonitor to track down some problems from special application. RegMonitor don't need snapshots and displays real-time activity. You can restore your Registry from activity records.

Limitations:

Limited functionality