Geting rid of backup pop up

For the last few days my Norton with backup has started having a pop up telling me I am not using my back up. I know this and do not what to use it as I have a better system in use. I find it near impossable to get rid of it, task manager doesn't work and I have to reboot top close it.  Along with many I am fed up with the firefox/vault mess and though I have over 170 days left am on the point of getting rid of Norton.

How do I stop the pop up short of total removeal?

 

The only thing I have noticed is after TaskManager does nothing and a reboot reliabitlity history  has

 

The program nsbu.exe version 13.0.2.6 stopped interacting with Windows and was closed. To see if more information about the problem is available, check the problem history in the Security and Maintenance control panel.
 Process ID: f0c
 Start Time: 01d14ac0acdb6f4f
 Termination Time: 4294967295
 Application Path: C:\Program Files (x86)\Norton Security with Backup\Engine\22.5.5.15\nsbu.exe
 Report Id: c37cde23-b71c-11e5-8521-ac7ba147ddc0
 Faulting package full name:
 Faulting package-relative application ID: