Not only is it difficult to tell which applications are installed, it is difficult to tell if an application is still installed as all too many applications do not remove all their registry keys upon uninstall.
I was going to suggest using a commercial application due to the messiness of this problem but the one I tried "Tally Systems WebCensus" (now owned by Novell) failed to find NuMega BoundsChecker and it also believes Yahoo Messenger is still installed even though it was uninstalled. Neil -- http://mail.python.org/mailman/listinfo/python-list