Ok, Have you looked in the application event log using the event viewer? Take a look there. If there is a message relating to MDS, and overlapped I/O in progress, then look in the system event log.
If the error is that the JVM could not be loaded, then you need to repair the installation of MDS using the original setup media.
I had this problem recently and ran the setup again, choosing repair. This worked fine for me.
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