Hi,
That is a well known Windows bug of the Security Center repository not resetting properly.
To solve this problem do the following:
1. Temporarily disable the WMI service (Windows Management Instrumentation) in: Start ->Run -> type: services.msc and in there find and stop WMI
2. Next delete the C:\windows\system32\wbem\repository folder, wait for it to recreate (it can take a bit of time.)
3. Restart the WMI service & restart the computer