You got a few problems on your hand I see. Do you have a XP prof disc available?If so try to do a repair with sfc/scannow and have your XP pro disc ready since it will need to copy those files from the disc. Here
is an excellent tutorial on that subject.
If that doesn't work :Here
is the download for this file.
Put in in C:\WINDOWS\system32. If you find the same file overthere rename that file to mmcdnmgr.old and put the freshly downloaded file there. After that go to START RUN and type regservr32 mmcndmgr.dll ( mind the bracket) and try to reboot