Step 1. Go to Start, Control panel, and click on Administrative Tools (found under System in Vista and 7), and click on Services.
Step 2. Right-click on Windows Management Instrumentation and from drop down list stop the service.
Step 3. Find folder C:\windows\system32\wbem and identify and delete the repository folder from your computer.
Step 4. In Administrative Tools find Windows Management Instrumentation service again, and re-start the service by right-clicking mouse and select start from drop down list.
NOTE: Restarting this service rebuilds the repository folder database on your computer, which should now only contain information about your currently installed security programs.
Step 5. To reset the Windows Security Center you must reboot your computer.
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