[Flipeoke]

I'm just guessing here, but when you did the uninstall of Hoster, and realized you couldn't install, are you sure you booted from the "back-up" D: drive? or did you boot from C: and try to use the Hoster from D:

Perhaps, if you booted from C: some of the files needed for Hoster were missing (since you uninstalled) and it would not run properly. To my knowledge, (Which I admit is somewhat limited) if you have an exact replica of a drive you should be able to do anything you want to the first w/o messing up the second...(unless you are using a RAID configuration) This being said, either you mistakenly booted from drive C, or the drives were not identical...when was the last time you booted from D: and tested it out...?
Did you do any updates of Hoster after making your backup drive? If you did, and you were booted from "C:" and updated hoster on both drives, it is quite possible new files were saved in the c:\windows\system on your C drive, and not updated on your D:\windows\system or something to that effect... If this were the case, you either would have to backup again after updating Hoster, or boot from C:, update Hoster, then boot from D: and update again...

Again, not really sure, but just some possibilities I had thought of...

Flip