Uninstall MS Security Essentials.
Go to
http://www.avast.com/index
Download their free antivirus software.
Install it and run a scan.
Also go to
http://www.malwarebytes.org/
Download their free version.
Install and run malware scan.
Once you have run these two scans and have cleaned any malware off your system, feel free to try MS Security Essentials again (although it's not really necessary).
I recommend buying a license for this software, but it isn't a requirement. Either way it will serve you better than MSSE.
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