[dhs12345]

How old is your computer?

I liked MSE. A lot less intrusive with less bloatware than Norton and Mcafee and best of all it is free. It has worked fairly well.

For home, I'll probably install Norton which is free through Comcast.

[The Cajun]

My new one is a Toshiba Qosmio about 2 weeks old.
I was running XP on my old machine with MSE.
The Toshiba came with Norton, one of the first things I did was to get Windows Defender up and running and uninstall Norton.
Also installed Malwarebites free and Kaspersky TDSSkiller also free, to keep an eye on Windows Defender.
I run them once a month to make sure nothing slipped through on Microsoft.
Never had a problem with MSE, don't expect problems with Windows Defender.

Oh, while I was setting up and had only Norton running, it let a bunch of adware/malware through, Malwarebites cleaned it out.
Setting up Windows Defender became my priority after that, no further trouble since.