Welcome to PCHF richard!
By 'beep' do you mean a beep internally from the PC or out of the speakers?
Also do you get any blue screens if so - please follow the
BSOD link in my signature and post the results back here.
It is possible you have a memory problem, but tbh if you ask any tech person or any member on here you will realise that Norton isnt that good.
Looking forward to your reply,
Chris