I run the licensed version of MBAM alongside Microsoft Security Essentials with NO issues.
Incidentally---I think the normal price is $25 for a lifetime license.
But there is a promo code that will knock off about 10% from that price. I used it successfully. It's just a little 6 or 8 digit code that I did not save.
You can probably find it with Google.
I like the licensed version--it auto-updates definitions 3 or 4 times a day.
Edit:
Just googled it myself. Look here:
http://news.dtcdeals.com/malwarebyte...agipsul-virus/
or here:
http://www.couponsnapshot.com/mercha...als-10854.html