I was running Hyper-V when I needed to extend the OS partition size. I shutdown the server, extended the partition and boot it back up. Windows saw the 20GB original partition, but then also the 10GB empty space, but I could not extend it since the disk was in use. So I shutdown the server and started a new server with this drive that I wanted to extend attached. I was able to extend that 20gb to 30gb no problem. Started up my original server, and received the error

Missing or corrupt winload.exe (0xc000000e)

Ouch. Why? Well the fix is, boot your windows server CD, repair, command prompt.

Run these commands:

x:\windows\system32\bcdedit /set {default} device partition=c:
x:\windows\system32\bcdedit /set {default} osdevice partition=c:
x:\windows\system32\bcdedit /set {bootmgr} device partition=c:

And you will be all set.

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