This has happened on a Vista Sp2 and Windows 7 Ultimate computers. First I installed the 2 operating systems on 2 different machine. Then I installed PowerDvd on both and tested it out. It worked fine on both machines. Then I installed Bitdefender 2010 Total Security on both machines and the exact same thing happens on both machines. When I put a Dvd in PowerDvd 9 Ultra will not start up. When I click on the dvd drive to try and get it to play manually it starts up then crashes.