I have an old Acer all in one computer currently running windows 7 home premium (64-bit). The computer starts up normally but just before it gets to the login screen the computer flashes a black screen. I have started the computer in safe mode and attempted a windows repair but it still flashes on this screen. When I was running the windows repair the screen did not flash once. I believe this is a corrupted windows. Is there any way to possibly fix this and keep all my data?