Thanks Mr _Brian
I have done repair via add/remove programs on the clients but its not working also i have try following steps:
Remove the Network Threat Protection (NTP) component, then reboot the machine and install it again.
- Control Panel > Add or Remove Programs > Symantec Endpoint Protection > Change > Modify > Network Threat Protection > Entire feature will be unavailable.
- Reboot
- Control Panel > Add or Remove Programs > Symantec Endpoint Protection > Change > Modify > Network Threat Protection > Entire feature will be installed on local hard drive.
but both are not working ideas.