Hello, In this case, you

Hello,

In this case, you could work on the steps below:

Sylink.xml location has changed in SEP 12.1

1. Click on Start and Click Run 
2. Type smc -stop in the run field 
3. Copy the sylink.xml file and paste under "C:\Documents and Settings\All Users\Application Data\Symantec\Symantec Endpoint Protection\12.1.xx.xx\Data\Config" it will prompt do you want to replace the file click on Yes. 
4. Start the smc service 
5. Click Start and Click Run  
6. In the run field type the following command: smc -start 

OR

You could use the SylinkDrop Utility. SylinkDrop is INSTALLED on the client by default.  In fact, by default, those steps won't work, because tamper protection will prevent you from touching the sylink file.

Just run Sylinkdrop from here: C:\Program Files\Symantec\Symantec Endpoint Protection\<Version>\Bin and you can replace the sylink file.

OR

Using the "SylinkReplacer" Utility

http://www.symantec.com/docs/TECH105211

To get the SylinkReplacer version_12.1 Utility, you will have to call symantec or log a web case.

QuickStart Guide - Create and Manage Support Cases in SymWISE

http://www.symantec.com/docs/HOWTO31132

How to update a support case and upload diagnostic files with MySupport

http://www.symantec.com/docs/TECH71023

OR

Regional Support Telephone Numbers:

United States: 800-342-0652 (407-357-7600 from outside the United States)

Australia: 1300 365510 (+61 2 8220 7111 from outside Australia)

United Kingdom: +44 (0) 870 606 6000

Additional contact numbers: http://www.symantec.com/business/support/contact_techsupp_static.jsp

Hope that helps!!