There were no Norton Utiities items listed - the only Norton item was Norton Securities. I used CLI to generate a list of apps on my PC (Get - AppxPackage l ft name, PackageFullName - autosize) using PowerShell.

One further thing that I've done which I think further clinches the uninstallable NUP item as being the culprit.

I'll post the outcome from what arises from Norton Support. I think you've helped me get a bit closer to a solution. Thanks for all your help and advice Peterweb. I think I need to find a way of being able to uninstall this before I can get NUU to install. I can get the uninstall process to start, and it runs until it reaches a point where it says 'Delete File error : C/ProgramFiles/CommonFiles/microsoft Access to the path is denied at System IO FileSystem Info set.' then the code whizzes by fast and keeps returning to the same thing again and again. I still suspect that the source of the problem is the pre existing NUP item which cannot be uninstalled. But in contrast with your situation, there are no NU files to be found on searching, apart from the download exe files which won't install. Your observation about where it says 'download failed' is just what I get.

It shows in Task Manager - not completely inactive - cpu usage occasionally reaches as high as 4.5%, but also drops to 0. Same as before: the window 'Installing Norton Utilities' comes up, with 'The wizard is upgrading your product'. Next: I've deleted the 2 NUP files I found in Program Files, restarted and tried installing the NUU download exe file again. First: OS is Windows 10 & version is 21H2.

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