"This error occurs when your application indirectly calls a pure virtual member function in a context where a call to the function is not valid. In most cases, the compiler detects this and reports the error when building the application. But depending on how your code is written, sometimes the problem is detected only at run-time." 
Contact Symantec to see if they have an updated binary. They will probably tell you to upgrade to 6.5.6
Another one-time-never-return poster..... 
