uninstall all antivirus software and replace w/ mse.
if you ever want to uninstall a program i suggest using revo uninstaller (you can use the portable program which doesn't install on your comp in the below link scroll to bottom of page and click "download" button next to portable.
the reason for this is that if you just go to programs - add/remove there are still pieces of the program that remain after you uninstall it.