C and D drives reversed - Bootmgr is Missing error

[diddyp]

Need help. Have been having HD problems and was attempting to create a bootable external media option using the EasyBCD tool.
However now whenever I boot system I get the message "bootmgr is missing" - so unable to bring up OS because C: and D: drives are now reversed (C: is now 10G recovery drive instead of OS drive.). Attempted recommended EasyBCD repair and now recognizes 2 drives instead of one:
Now on boot finds:
Microsoft Windows 10239 MB (C: Recovery
Windows Vista Home Primium 228128 MB (D: OS

Do have original system CDs.

Have attempted startup Repair on either drive - repair fails
Repair on D: drive attempts Bfsp(CopyFile) thou fails on up to 60 line attempts
Repair on C: drive (fails)

Found a 'HKEY_LOCAL_MACHINE\System\MountedDevices suggestion on MS site to rename the \DosDevices\C: pointer. The primary partition drive letter designation is lost when you use WinRE to repair a GPT volume in Windows Server 2008

However have not tried this yet. Besides formatting drive and starting over any other suggestions?