Good suggestions:
Been there done that
ACT! 6 is an old version of a CRM (i think they r up to ACT! 12) that needs to be installed directly without the menu setup program (does not run in W7) and run in compatibility XP /3 and as admin.
Didn't think of task manager -- but
When I start the program dllhost.exe and setup.exe *32 open in task manager => dllhost closes but setup remains running. Everytime I start it another copy of setup appears but nothing ever runs even with just one.