I need help enabling AHCI in Windows 7

[SickBeast]

I've tried changing the registry setting and then going into my BIOS to enable AHCI, but then Windows won't boot and says "BOOTMGR is missing". Do I need to boot the Windows DVD and do a recovery of some sort? I'm surprised it isn't just working for me. Am I doing something wrong?

If any of you have experience with this and can help me out I would really appreciate it.

 

[MagnusTheBrewer]

Here you go.

 

[SickBeast]

That's not the error message I'm getting and I've already tried that solution and it's not helping at all. Thanks for trying though.

 

[MagnusTheBrewer]

That's not the error message I'm getting and I've already tried that solution and it's not helping at all. Thanks for trying though.

How about trying bootrec /fixmbr

then

bootrec /fixboot

 

[Rifter]

I ended up reinstalling windows when i tried this. The reg trick didnt work for me either.

 

[postmortemIA]

strange, that message means more or less that no partition was found on drive. bootmgr file is usually placed on C:\
Are you sure that your first drive is still one that system boots from? it might changed in BIOS when you switched to AHCI.

 

[Black-Wolf]

I went through this after a bios update which changed my boot priority. Make sure it hasn't been changed. Also, there is no bootmgr in Vista or 7. In XP just reset defaults in the bios.

 

[stargazr]

Is this a fresh install? If you load Win 7 with other drives attached, for some reason the boot files might go on another drive.

 

[SickBeast]

strange, that message means more or less that no partition was found on drive. bootmgr file is usually placed on C:\
Are you sure that your first drive is still one that system boots from? it might changed in BIOS when you switched to AHCI.

You're a genius! That is indeed what happened. Thank you very much for the tip. I was getting really frustrated.

Thanks everyone for your input.