Hi,
I think you should try to repair the SEP client from Add/Remove programs.
If the issue persists, please try the steps below:
1. Right Click 'My Computer' & Select Properties
2. In the Advanced Tab select 'Environment Variables'
3. In the 'System Variables' text box scroll down and Highlight 'Path'
4. Choose to Edit
5. Look for Variable Value
6. Without changing the existing contents; at the end of the sting, add the exact path for the 'symcorpui.exe' file. (e.g.: By Default the installation path of the file is "C:\Program Files\Symantec\Symantec Endpoint Protection")
7. Once done; Click Ok on all the open properties pages.
What we are doing here is setting a path to SEP folder manually, in case it is corrupt/misconfigured.
You can also make sure that the smc exe exists in that location.
Best Regards,
Aniket