Afterward, please click Start, then Run, then type in "WGAtray.exe /b" and click OK, then reboot.
If the above procedure does not resolve your issue:
Please follow this diagnostic troubleshooting procedure:1. Download and run the MGA Diagnostic Tool:
2. After running the MGA Diagnostic Tool, click on the "Windows" tab and then click on "Copy".3. Next, visit the following website and create a post in the "WGA Validation Problems" forum and paste the results of the WGA Diagnostic Data in a detailed post. http://forums.microsoft.com/Genuine/default.aspx?SiteID=254. A WGA troubleshooting specialist will analyze the data and recommend an appropriate solution.