I am currently running windows 7 64bit. I was having issues with my BD 2015 interface so it was recommended that I run a repair. I did this and then it said to restart to finish. I restarted and low and behold no windows. It will only start the start-up repair function and it does nothing else. I have ran the repair multiple times and it wont fix it. I can access the command prompt but have no idea what I can do with that. I am completely lost as to what to do and chat here at BD says they need to escalate the issue and it can take a couple of days. I really hope someone here can help me. I paid for this ###### program and I don't want to have to format and lose a lot of important things because of their repair not working. Maybe there is someway I can bypass it booting any bit defender files?? Please help me!!!!