how list all the programs installed in a computer ????

Question

I am creating a system in C # in which I need I need to list all the programs installed in a computer and the route of the .exe of the programs..... Reviewing the registry of windows(ya that my stations are win2000 and xp) encontre this route: HKEY_LOCAL_MACHINE\SOFTWARE\MICROSOFT\WINDOWS\CURRENTVERSION\APP PATHS Nevertheless are not all the installed programs, tries with this other route but either this complete one: HKEY_LOCAL_MACHINE\SOFTWARE\MICROSOFT\WINDOWS\CURRENTVERSION\uninstall Help... any suggestion is very well received... Saludos, nathaly Sorry by my little ingles :o )