Hi Penny,
There was an issue with w32.mabezat.b false positives last week. That issue was addressed with definitions released Friday evening (8/26). Make sure you have the latest definition set. You should be able to go into your Norton risk log and "undo action taken" on the acad.exe file.
Let me know how it goes for you.
Regards,
Thomas
P.S. In the future you should post Norton issues in the Norton community. There are many more Norton experts there to help you.
http://community.norton.com/norton/