Windows 7 - MSE corrupted

My Microsoft Security Essentials has become corrupted. It cannot install updates, it can't be uninstalled 'cause it can't find one of its files, and Revo Uninstaller doesn't even list it as being on my system. It may have been corrupted ever since my last Repair Install last week, so restore points are probably not an option...

Any ideas? Thanks!

How about system image? Possibly one was made since the problem?

Edit: How about trying to reinstall?

It's a long shot, but tried to reinstall over it?

Does the installer have a Repair option like WLE?

Tried that already. Unfortunately, it tells me to uninstall the original version before installing the new... and there is no repair option listed. But a good try! Thanks! Points for you!

Go to search look for MSE and manually delete everything you can find, then reinstall.

And try do a quick sweep of the Registry manually, just to make sure if you try and install it, it wont try and refer to a file in the registry to see if its already installed.

What do you think will happen, if you change the name of MSE, put it in a folder and then try to delete?

Ain't this grand! I replaced MSE from my backup using Acronis, now I have no internet access at all. (I'm using my laptop to write this.) I am getting seriously pissed off.

I have had nothing but trouble with this installation. The RC7100 was great, this release is a dog.

First the Event viewer went down, then the installer crapped out. Now MSE is corrupted. I'm sick to death of Repair Installs and restore points. I'm gonna do a clean install, and that better clear up every single issue permanently.

Later guys... I'm off to waste a couple of evenings reinstalling everything. I'm not going to keep chasing bugs around this installation.

Did you do a clean install in the first place? and Good luck.

Yes, a clean install from x7100 to x7600 back in October.