please do yourself a big favour and get rid of security essentials and go back to Avast, you'll be glad you did.....

I deal with many many machine that were runninMicrosoft'sts security essentials, alspy-warere ridden, somabsolutelyly crippled, Avast on the other hand deals with most of the nasties thrown at it, I also advise the combined use of at least two of the following;

Ca yahoo anti-savailableable with the US version of the yahoo toolbar.
Emsisoft Anti-malware - finds traces other leave behind
Malwarebytes
Superantispyware
Iobit malware fighter - this one still beta, so some false positives

I would also recommend;
McAfees Siteadvisor and AVG link Scanner for safer surfing

stay clon-lined safe online
cheers