UAC pops up when printer is plugged in.
I just packaged an HP Printer Driver using the HP Driver Deployment Utility called PARK which generated an unattended EXE file. The package installs through SCCM without any problems but when the printer is plugged in to the USB port, the UAC alert pops up. If I click NO, it goes away and the printer works just fine, the scanner and the printer. But if I unplug the printer and plug it back in, the UAC pop up is back.