Error Message after Reinstalling NIS

A Norton technician reinstalled Norton Internet Security to resolve a problem on my computer running Windows XP.  Since then the following message is displayed: "C:\PROGRA~1\Symantec\S32EVNT1.DLL. An installable Virtual Device Driver failed  Dll initialization.  Choose 'Close' to terminate the application".  Although I click on 'Close' the message still reappears about every five minutes.  Any ideas on how to get rid of it please?