Alright run memmaid in advanced mode and check dead registry entries and the deleted program icons (something like that), along with what it already checks. You can get the beta
here. It will remove temp files, and other items from a bad install.
to close programs instead of leaving them running I use magic button which can be found
here.
I also suggest u hard reset after testing many programs, and reinstall only what u like, thats after ur finished testing.
Hope this helps.
~mike