I have used DVD43 several times and every time I install the program my system slows down and I have all kinds of errors. All errors go away away I uninstall the program. The program works fine for coping DVD's but screws up your system in return.
It may use up some RAM but it may also be conflicting with another programme on your PC. I have it installed but it gives me no problems. It is not essential to have anyway so simply uninstall. You can try and get another region free software by looking in the software section.