Hello,
I believe a simple restart would help.
In your case, I would not recommend repairing the Symantec System Center to be the First steps of Troubleshooting.
However, if that does not help, then you could try repairing the Symantec System Center (SSC) from add remove Programs.
NOTE: Repair of SSC does not require a reboot.
Secondly, On a Kind Note - I would recommend you to Migrate to SEP 12.1 as SAV 10.x is nearing the End of Support Life.
Check this Featured Article:
Be Aware: The Symantec Antivirus Corporate Edition 10.x and Symantec Client Security 3.x End of Support life is July 4, 2012
Hope that helps!!!