The application probably left behind some info in the registry.....run regedit and do a search in the registry for the application by name, also there is a folder on the C drive under Document and Settings called Application Data...check there for the applications name and delete it from there that should do it for you....

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2004 4.4i Titanium Silver
Eisenmann Race Exhaust
Sirius/Nav/BT/Aux/DSP
4.8 Body Kit (Rear only so far)
ACS Pedals
Aluminum Running Boards
DINAN High FLow CAI
20" Style 87's