Windows 10: start button Inoperative search partially working no rollback help

I foolishly upgraded to 10 from 7HP OA 64bit at the begining of the month and all appeared fine except for occasional unexplained desktop background changes until yesterday.
Suddenly the start menu dissappeared and search did not work.
On line info suggested this was common and suggested a fix using powershell
Fix failed
With no start menu I struggled to access restore or similar options
Found access to restore and selected most recent retore failed and no boot
Several Blue Screens later and promises to repair etc non of the restore points were viable. I had no boot
Following on screen suggestions I tried Reset ...... Failed due to Cortana problem ???? said Boot device inacessable etc etc
Eventually found access to safemode and managed to boot and restore worked on third attempt.
Roll back to win 7 failed due to all folders in win old being empty or deleted by MS before the month was up
Still no solution to start menu or search cannot rollback and cannot download an ISO as Gateway/acer product key will not verify
No Cortana because it is now not available for english english and no edge as I cannot find it and no other apps
I have a broken system but I have managed to restore some functionality although it is very slow.
Some one suggested a conflict with Avast so have removed Avast and Defender is running

Advice will be gratefully received
Thanks
Dave

:)

 

Inoperative start button

Hi,

Thank you for posting in Microsoft Community. We are sorry for the inconvenience caused.
also ask these questions.

- Did you make any changes to the pc prior to this issue?
- Are you facing this issue on a local account or the MSA?
- Have you installed all pending updates on the pc?

Ensure to login to the Microsoft account to check if that helps.

Also suggest you to install any pending updates on the pc to check if that helps. Updates are additions to software that can help prevent or fix problems, improve how your computer works, or enhance your computing experience.


if the issue still persists then refer the below steps.

1.Open the Task manager. Here’s a tip: Press CTRL+Shift+ESC.

2.Click File > Run New Task.

3.Make sure you have a check mark beside “Create this task with administrative privileges”

4.Type CMD.

5.Type the following 4 commands at the CMD prompt:

dism /online /cleanup-image /restorehealth

sfc /scannow

powershell

Get-AppXPackage -AllUsers |Where-Object {$_.InstallLocation -like "*SystemApps*"} | Foreach {Add-AppxPackage -DisableDevelopmentMode -Register "$($_.InstallLocation)\AppXManifest.xml"}

6.Close the CMD window

Check to see if the issue is resolved. If not, restart the PC.

If the issue occurs with the MSA then you can also run the Microsoft account troubleshooter to check the status

Microsoft Account Troubleshooter:

http://download.microsoft.com/downl...B-A23B-5C3A6B5974E3/microsoftaccounts.diagcab

Hope this information is helpful. Please do let us know if you need further assistance, we’ll be glad to assist you.

 

Inoperative start button

Every time I try to click the start button, I get a "critical error" message that says: "Your start menu isn't working. We'll try to fix it the next time you sign in." It never gets fixed and I have no access to any of the start menu or apps. This is
getting old. How do I fix it?