Congratulation and many thanks for your tool.
Please, consider this feature in your next releases.
Deleting MRU entries list located in installing new devices/driver (windows based system). Please, see: panel control/add hardware/...
The registry key is "INSTALLATION SOURCES" in (for XP and Vista)
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Setup.
Please, see the screenshoot in attachment (sorry for italian version of windows but I'm sure that you are able to understand just the same)
Regards.