My guess is you'll find other files under your profile in the applications folder as well as references in your registry. You can clean these out or leave them. They've yet to invent a broom that clean up a room, empty it's own garbage and make its own self vanish as well.
I uninstalled quiken books from the install/unistall screen within windows xp control panel. I then went to c/program files and found files from the quicken books there is it ok to delete these files. I have no intrest in ever installing quiken again.