Start button not working

I don’t like Cortana and I have disable it. I put Windows 10 updater in automatic and since december, every so often, after login, appears this message: critical error, Start Menu and Cortana doesn´t work. OK, fixit with sfc /scannow command and restart, by two days ago, I’m stuck with this: Start button not working. Maybe after last Windows 10 updated. I am going to try this command since Powershell: Get-AppXPackage -AllUsers | Foreach {Add-AppxPackage -DisableDevelopmentMode -Register “$($_.InstallLocation)\AppXManifest.xml”}

It is too early to reinstall, but I’ve downloaded ISO image Windows 10 Spanish 64-bit (Win10_1511_SpanishMexico_x64). Will serve the product key of Windows 8 Single Language?