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What program for example?
This message might appear, if you try to to run 16-bit app on 64-bit OS or 64-bit app on 32-bit OS.
I can't run any program as adminstrator, even cmd
Try to restore file associations, if it does not help, you might need to do a repair upgrade.
Restore Default File Type Associations in Windows 10 Windows 10 Customization Tutorials
Repair Install Windows 10 with an In-place Upgrade Windows 10 Installation Upgrade Tutorials
You user account might also be corrupted. Try creating a new local account, assign it administrator privileges, log into it and see if the problem exists in the new account.
I tried restoring file associations it didn't work, then I tried reseting my PC but it says that there was an error and that nothing was changed
I already tried making a new account but it won't let me, when I click add someone else to this PC nothing happens