This indicates a connectivity issue of some sort with Windows Update. See this article for general troubleshooting:http://support.microsoft.com/default.aspx/kb/836941?p=1
Also, check your PC date/time:
Right click the clock in the system tray. Select Adjust Date and Time.
Verify and correct the month, day, year, hour, minutes and time zone.
Reboot if you changed any of the above.
If that does not resolve the issue, please open a support case.
To open an email support case, start here: