I have a Gateway GT 5220 with Windows Vista Home Premium x32. For quite some time now I haven't been able to start the computer without having the "Windows Vista Home Premium Express Upgrade" disk that came with my PC. With the disk in I can easily turn the computer, and Windows boots and after that I can eject the disk and it still runs. Without the disk however, the computer starts up, but doesn't make it any further, saying "BOOTMGR is missing press Ctrl+Alt+Del to restart." I have tried booting from the disk and running Startup Repair and the Memory Diagnostic Tool. I have also tried reinstalling Windows (I needed to anyway) but without having any luck in fixing this issue. Thank You very much for your time in helping me resolve this issue. If any further information I can provide that could help us corroborate an answer to this problem, I will gladly do so.