Dear kavrikeew,
Thank you for reaching out to the Microsoft Q&A.
It sounds frustrating to run into error code 0x1 when launching Minecraft with your Microsoft account!
To fix this issue, you can try following some steps below:
- Go to Start > Control Panel > Uninstall a program
- Select Minecraft in the list
- Right-click it then select Uninstall
- After uninstall process finished, you can re-install Minecraft at Download Minecraft & Server Software | Minecraft
- You can also re-install Minecraft from Microsoft Store
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Best regards,
Bryan Vu - MSFT | Microsoft Q&A Support Specialist