Your program does not scan the registry section listed below for obsolete traces.
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Installer\Products\
I'm curious, what would be the advantages?
And as with all things with the Registry, what are the consequences?
Have you manually included it yourself and found any side-effects?
I ask because I believe if you start playing around with \classes\installers\products should you also include \classes\installer\patches ?
And if you start touching the HKLM hive, should you include the HKCU hive for each user, and if yes, they are split into managed and unmanaged installs, for the managed ones you go back to HKLM but a different area.
I just looked at every key I have in there and nothing was invalid on my system (which is a 5 years old XP install at this point), and all seem to be from MSI installers. Although I suppose a botched crappy uninstaller could leave junk behind.
System can store some information from the distribution kits of applications already removed from the system. Removing these traces is completely safe. Please look at the attached snapshots where it shows a comparision between valid and invalid data in that section.
I don't have anything like the invalid screenshot, but then again I rarely install and uninstall software.