This freeware portable utility will reset all the Registry and other settings of Microsoft Security Essentials to default value. In case anytime, you find that you are facing any issues in running Microsoft Security Essentials due to any reasons, simply run this utility. This utility will restore all its registry values & service settings to known good defaults, without re-installing MSE. It also re-registers the concerned .dll and .exe files, required to run MSE properly. The utility may take only a moment to run, but rest assured, it does the job.