On my site is an article about installing RH and for older
versions it includes a link to Adobe's site which explains some
registry entries that may need removing manually. RH7 has been
changed and should clean the registry. You could see if the old
article locates anything.
Be very careful, backup your registry and only do anything
with the consent of your IT guys.
Also you could try a registry cleaner but again be very
careful. They can be dangerous.