Today (Friday)I downloaded the MSE install file. I installed it without internet connection. I downloaded the latest manual update on another machine, put it on a jump drive and installed it. The antivirus scanned the machine fine. Said no problems in machine and is up to date. My question is when I connect to the internet will it disable my MSE? Update: Saturday morning I turned on automatic updates and then opened MSE and clicked on "Update" it said I was up to date. I thought it would have disable MSE but it didn't. (XP Pro was installed just this past March 2015)
Yea it is still running on XP. It was suppose to be shut down about a year after XP shut down but mine is still running and updating. Just make sure your running V4.4.304.0 and DON'T try to upgrade to a newer version or you will get screwed up.
Get rid of MSE entirely! the latest MSE definition updates (starting in mid-July 2015) no longer work with MSE 4.4.304.0 on XP as I tried this myself on an old XP computer a few months ago.
Microsoft Security Essentials is garbage anyway, it does little to protect you against the latest malware, Microsoft said so themselves. Get a real free antivirus like AVG or Panda.
Uninstalling defender from younger windows isn't exactly straightforward, especially for the average users. On win10 isn't even possible to disable it, at least using the official way.