Portree - welcome to the forums
Yours is a problem I haven't come across before - but there a couple of things to try to solve the problem.
Can you remember if you installed any software just before the issue started? if so, my first port of call would be to unistall that software and see if that solves the issue.
I haven't heard of a a bell showing up in the bottom corner before - but it sounds as though an added application is doing that as a notification - as it is not a default windows function - again if you can find what software is putting the bell there - try uninstalling that and see if the issue is resolved.
As a final step a hard reset will completely clear your machine of all programmes and data (not from the filestore or any storage cards - you will need to delete programmes from these manually).
Don't forget to back-up your data first though

. You don't need to back-up Outlook information on your device as this will be resync'd when you reconnect to your PC after the hard reset (I may be paranoid - and I know that this syncing is going to happen - but I ALWAYS perform an export from desktop outlook of my complete outlook information before I do this - just in case

)
After the hard reset I would install my applications one by one and see which one causes the issue to resurface - you may still be able to use that software as there are probably settings that you can change to adjust how you are notified - but if there are not then I would find another application that doesn't cause the issue.
Let us know how you get on - as I said - haven't come across the issue before and would like to know what caused it.