Tasktry icon shows gray circle with white slash after upgrading Adobe Reader from v8 to v10

After installing the upgrade of Adobe Reader to version 10 and then restarting computer, the Norton 360 task tray icon shows a gray circle with a white slash.  The product Norton 360 still opens, I can run N360 LiveUpdates, and I can run a scan.  I do not know if the gray circle with white slash represents a problem or not.  The product still seems to work.  I'm interested in any advice or warnings.  (Also note, I opened Norton 360 from the desktop icon - did not yet try using the task tray icon).

 

(Yes, I DID remove the checkmark on the Adobe Reader 10 download page about the MacAfee Scan).