I just finished restoring an old computer, win xp home, Celeron CPU 2.60GHz, 2 gb RAM. Installed MSE and the system slowed to a crawl. MSE uses about 3 times the resources of Avast. Makes a big difference on this older computer. 5 minutes to the welcome screen. So I uninstalled MSE using add/remove, intending to install Avast.
XP crashed.
Black screen said something like "Windows can not start, \windows \system32 \config \system (or maybe Systemprofile) is missing. Press f2 at the next screen". f2 wanted to put me into a restore mode, back to square 1. If I recall, there was no safe mode available. Not sure about that.
To avoid reinstalling from scratch, I used an image to restore the system with MSE still in it, and then the fun began. I uninstalled MSE manually.
MSE is honestly harder to remove than realplayer or iTunes. Some of the locked files required the use of Unlocker, and much of the registry stuff required changing permissions. None of that was mentioned in the instructions, and there was a ton of stuff leftover that was not mentioned at all. I know that an antimalware app is supposed to be hard to neutralize, but good grief, it isn't supposed to set up like concrete. You would think that microsoft would at least make an uninstaller, like other antivirus developers do. I think I saw something about one out there, and there is a "Fix it for me" option on the ms website, but I didn't want to try it, after all the first ms app gummed things up pretty good. The ms instruction sites are : http://support.micro....com/kb/2435760 and http://support.micro....com/kb/2483120
Both of them end with "Step 3: Reinstall Microsoft Security Essentials". Yep, I'll get right on that.
Anyway, the old computer is running, jogging, strolling along nicely now. Starts quickly and runs ok after it that. Not a gamer PC, but ok.
I didn't post this just to whine, but to maybe alert others and to see if anyone else has run into this issue. So a suggestion and a question.
The suggestion is to always have a recent system image handy before installing anything. I almost just trusted microsoft, after all it is their OS and their antimalware app, but instead I put in an extra 30 or 40 minutes to make a backup image beforehand. Good thing.
And the question is, have others had this kind of trouble? Google found some information about it but nothing as drastic as my situation. And I could not tell for sure if there is an effective uninstaller or not.