Windows 10: Who do I complain to?

I was trying to find another browser, but I think Microsoft has altered Windows 10 to make sure that

no other browser besides Edge will work. I can no longer use Chrome. Opera acts up. And Opera Neon doesn't work at all.

I don't like Firefox. I want to complain to Microsoft. Is there any way to contact them?

:)

 

complain

You will be much better off complaining directly to
the game developer than complaining here, where no one can help you.

 

Windows.old automatically deleted the day after installing Windows 10

A simple websearch would have given you info quicker than complaining about someone suggesting to upgrade to Windows 10 and something causing the Windows.old to be deleted, which I doubt was caused by Microsoft.
Rebuild System Partition

The second way here we can put forward is to rebuild the system partition. If you don't want to pay a penny to do the lost partition recovery, try this method. Note that this requires you have the Windows installation disk. Now follow the instructions to begin.
Preparatory work:
Boot the computer using the Windows installation media for your running OS. Then on the first installation screen, press SHIFT+F10 to bring up the command prompt.
Now run the following commands at the command prompt.
Step 1:
bootrec /fixmbr
Step 2:
diskpart
select disk 0
list partition
select partition n (n is the Windows OS partition)
active
exit (exit diskpart)
Step 3:
bootrec /fixboot
Step 4:
bootrec /rebuildbcd

 

Restore Microsoft Store application in Windows 10

After multiple attempts, I managed to get Store open by enabling Developer mode (as suggested by one of the posters here) and running the command "Get-AppxPackage -AllUsers| Foreach {Add-AppxPackage -DisableDevelopmentMode -Register “$($_.InstallLocation)\AppXManifest.xml”}" in Powershell. Not sure if is exactly the solution since I've tried different steps suggested by different users in different forums (including uninstalling Store separately) but hey, I am not complaining!