A few weeks ago I noticed Microsoft Security Essentials was not working. Whenever I try to open it, I get a dialog box saying the version is not compatible (this is not true). Also, I've tried uninstalling it and reinstalling, but I get an error when reinstalling. I've attached a pic of the error box.
I've noticed too that the computer is rather sluggish considering it is a high performance PC.
I suspect the machine is infected, but I'm not sure. Can someone help me resolve these issues, please?