I would humbly suggest trying a different anti-virus. MSE places near the bottom/at the bottom of almost all A/V's. Even Microsoft itself recommends a third party anti-virus. Just click on the link to see what they say.
Microsoft Admits That Third-Party Antivirus Is More Effective Than MSE
Actually Microsoft said something else if you go further down the site as you see below:
"Update: Microsoft made a statement in response to the PC Pro article, saying
"We are committed to protecting our customers, and our Microsoft antimalware solutions provide strong, comprehensive defense against malicious code and attacks. We believe in these products and are proud of the protection capabilities we provide to well over 150 million computers worldwide." P
I use MSE and I have never had a problem nor any of my clients