Hi,
I think first you will have to check which protection is blocking an action.
How to Create Exceptions or Exclusions for Tamper Protection Alerts that have already been logged
http://www.symantec.com/business/support/index?page=content&id=TECH92553&locale=en_US
How to configure Tamper Protection in Symantec Endpoint Protection 11.0
http://www.symantec.com/business/support/index?page=content&id=TECH102529&locale=en_US
Configuring a centralized exception for a detected process
http://www.symantec.com/docs/HOWTO27305
Configuring an exception to force TruScan proactive threat scans to detect a process
http://www.symantec.com/docs/HOWTO27304
About centralized exceptions for TruScan proactive threat scans
http://www.symantec.com/docs/HOWTO27316