Thanks Tuvok for the link, it is indeed very interesting. However I note that it does say....."There will be no need to purchase a new copy of Windows 10 provided it is being installed on the same Windows 7 or 8.1 machine that was upgraded to Windows 10".
It is the case that zebo has had a new hard drive and in effect has a new machine, without a copy of Windows 10 installed.
Now to try and help zebo get rid of the annoying Chimes. Click the following link and scroll down and you will then read :- "I used to work in IT and I can tell you that 95% of the time people call me in for this issue, is when a USB 2.0 adapter (mostly phone chargers) are connected to a USB 3.0 port. Unplug all USB cables, this will fix it". :-
http://superuser.com/questions/467206/windows-8-random-chimes-sound
Hans.