I'm sure it's on the web but here, across dozens of PCs at the office never happens.
Our bet is that it's our upgrade process. We uninstall the antivirus suite and if we find it any CD/DVD emulators. Now there is some issue with Torrents and infected PCs but we only see that outside the office.
TRY THIS. Create a new user account and see if the problem extends to the new user.
I'm running win10 which was upgraded from win 7, 64bit. The win 10 start button is broken. Left click does nothing at all, and right click brings up menu, but clicking on the menu items does nothing. This is a widespread problem, and solutions are offered in abundance. I have found that going to powershell and inputting this command Get-AppXPackage -AllUsers | Foreach {Add-AppxPackage -DisableDevelopmentMode -Register "$($_.InstallLocation)\AppXManifest.xml"} will fix the problem for a short period of time only.
I can't understand why Microsoft has not introduced a patch to fix this problem permanently. Perhaps someone reading this can offer a permanent solution. Or maybe explain why this is happening. Thanks for your help, Rob

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