Unauthorized access blocked target Ghost\Agent\VProTray.exe

In NIS 2012 security history this is logged every 1  minute i don't know exactly when this started but it is i think recent :

 

 

?Category: Norton Product Tamper Protection Date & Time,Risk,Activity,Status,Recommended Action,Date,Actor,Actor PID,Target,Target PID,Action,Reaction,Terminal Session 5.4.2012 17:26:44,Medium,Unauthorized access blocked (Access Thread Data),Blocked,No Action Required,5.4.2012 17:26:44,C:\WINDOWS\SYSTEM32\SPOOL\DRIVERS\W32X86\3\WRTPROC.EXE,6264,C:\Program Files\Norton Ghost\Agent\VProTray.exe,7964,Access Thread Data,Unauthorized access blocked,3

 

 

is this normal?

Why should this actor program WRTPROC.EXE try to access the target program VProTray.exe ?