Why are you trying to change the Service Tag, as this is set by Dell, and acts like a serial number, the Asset Tag is for companies to track assets,and has no relation to the service tag, unless you reference both in a DB somewhere to track what employee has as an asset. The only time a Service Tag is set is if a servicer replaces the system board from Dell. Asset tags can be changed at any time. Unless they changed something since I became certified. And the only way I could get the program to run is with a bootable dos disk.