I don't get it. I was having a problem with Microsoft Security Essentials, so I just uninstalled it and then reinstalled it. The reinstall seemed to go easily enough and it executed a Quick Search with no problems nor errors. But when I went to execute MSE manually by looking for the executable using Start ... ess enter, enter as I have usually done, I got a message saying 'Windows can't open this file'
Microsoft Security Essentials.lnk
Why can't I execute MSE as usual?