Hello,
We are using sep 11.06,I'm not able to give full symantec scan,it is showing error message.
error is :server is busy:this action is not completed because other program is busy.choose swith to activate the busy program and correct the problem.
thats an old version, install that latest 11.0.7 or do a uninstall /reinstall
Check the thread solution, hope it help you to resolve your problem
https://www-secure.symantec.com/connect/forums/client-gives-server-busy-message-scan#comment-4085751
You are running to old version, my suggestion is to upgrade the SEPM in 12.x
12.1 RU4 MP1a is latest and you have to direct upgrade.
How to upgrade your SEP11 license to SEP12 online
http://www.symantec.com/docs/HOWTO56030
http://www.symantec.com/connect/articles/sepm-11x-sepm-121-upgrade-process-graphical-overview-embedded-database
Reboot the machine and try again