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mmc could not create the snap-in

I bought a laptop and it had Vista. I installed Windows 7. Everything's been fine for a long time. I needed space on the Vista partition and deleted the files. Everything was fine until I tried to view my Event Viewer because the Stardock Impulse no longer worked, but the event viewer gave this error:

mmc could not create the snap-in

I did all this to put some of my music on the partition and hooked up my external hard drive...it would not mount. I tried some other external devices and they too no longer work.

I've run SFC /SCANNOW - no problems found.

I've uninstalled all .Net and reinstalled 1.1, 3.5, and 4.0, no change (1.1 SP1 wouldn't run, nor 2.0)

I've compared my system with another Windows 7 machine and not much difference in files. I'm at a loss now, and am ready to reinstall Windows 7, but don't want to reinstall my files and programs.

What surprises me is the variety of failures. I have MS Security and Norton's. I've NEVER had a virus (Thank the Lord) and nothing is detected. Any suggestions?
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Oh yea...Office 2010, the auto correct works, but when I put an animotion, the :) no longer changes to the smiley face, but a square box. So far, nothing else has changed.
Abdicate,
I have never had luck once I have removed and reinstalled .Net. I am not a programmer and I suspect they could tell me why but that seems to add to my troubles.

I have only seen what I think you describe once. It sounds like you are running 2 antivirus programs. That would be the first thing I would change. Second I would scan with Malwarebytes. http://www.malewarebytes.org and see what that came up with.

Short of malware I am thinking I would go after the fresh install. I hate the time but I love the performance.

HTH,
Ken
I am having the same problem without a solution.  Does anyone know?
No, only MS Security. Even Reg Mechanic can't find anything wrong. I've attached the screen shot.

Abdicate-368611.flv
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I don't think this should be asked if you answered your own question.