Oh and I nearly forgot what triggered me to look up this old post:)
A lot of people have the error bootmgr missing.
There are several ways to restore it, but one more is using VistaPE BootCD and your image made with DriveImage XML.
Startup using the cd > open DriveImage XML > choose the option "browse" and open an image that you know for sure was from a point in time you're computer was ok.
It takes a while to load - might be a minute or long enough to get yourself a nice cup of coffee, depending on the size of the file. <LOL>
Then you can simply select bootmgr and click on 'extract'.
By default it chooses my documents as a place to save things, but that won't help you, so make sure you edit that to just " C:\ " (without the quotes)
Click ok, restart and you should be all ok again.
Worked for me and is the easiest method I've come across so far.
Btw. if you have a bootcd you might as well save a copy of bootmgr on another partition or drive and you can copy that too to it's proper location. You won't even need DriveImage that way <LOL>.