Originally Posted by kaiibiux.
After resetting computer to factory setting and switching off modem, I installed a program which I used previously and it displayed free trial expired, which i use the free version anyway, but my question is, once the computer was restored to factory setting how do programs work out that the free trial was used? Just asking from computer security point of view?
uninstall the program next time with revo
do deep scan which removes registry keys left behind then reinstall
i have a vpn i do this with