How, or should I say what would be the typical methods used to control when a trial software program runs out? I have a device driver, that is supposed to stop functioning after Monday, next week. The driver is in the Windows/ System32/Drivers folder, and there is an entry in the registry under HKLM/System/ Current Control Set/ Services/ XXXXX. Where does it read the time from, the actual BIOS, or system clock? I am questioning, because I have this installed on a computer at my house, and the system clock is currently set at Wednesday, and everything is still working.