Hi,
Thank you for the post.
The Microsoft security client means MS Antivirus software like MSE or FCS.
Please uninstall and reinstall MSE or FCS on your computer to fix this error message.
If you could not remove MSE successful using the Add or Remove Programs, please follow articles below to manual uninstall it:
http://support.microsoft.com/kb/2435760
http://support.microsoft.com/kb/2483120
If there are more inquiries on this issue, please feel free to let us know.
Regards
Rick Tan
TechNet Community Support
