Can not uninstall NIS/NAV to install Norton 360

New Compaq  PC came w/Norton INternet Security temp license.  About to expire, so I bought the Norton 360 CD.

 

BUT

 

When I try to install this, mmessage reads "uninstall Norton Antivirus first".

 

Cannot uninstall Norton  I.S. "ANOTHER INSTALLER IS CURRENTLY RUNNING. PLEASE WAIT FOR IT TO COMPLETE AND TRY AGAIN".

 

 

BUT

 

Nothing else is currently running.

 

 

[edit: Clarify subject.]