I got this computer from my dad a while back, and it had XP on it for a while. Finally, I got a hard drive with Windows 7 Professional from my mom's work, and it worked fine.... UNTIL NOW *dramatic music*...
What happens is when I boot my computer and just leave it be, before Windows has a chance to boot, I get an error message that says
BOOTMGR is missing.
Press CTRL+ALT+DEL to restart.
I do that, and then just hit f12 to go to the boot menu and just boot from my Windows 7 drive. Everything boots fine after that.
I have completely reinstalled Windows, and it's still doing it. Before, my computer was 32-bit, and I upgraded it to 64-bit while I was trying to solve the BOOTMGR problem. That's pretty much the only thing that's changed.
I looked up my problem on the interwebs, and they all say to do a repair install. I can't do that, for some reason.
When I boot from my Windows 7 Professional install DVD, it just loads the setup files and goes straight to the option to select my language and to install Windows. It doesn't give me the "recovery tools" screen.
This isn't really a major problem, but it still stops everything from running smoothly. I have to actively be spamming the f12 key while BIOS is showing and boot from my OS drive. It's quite obnoxious.