Welcome sam huges,
I understand that your Windows 11 PC is continuously receiving arrow key input, preventing you from signing in.
Is the PC using a touchscreen display? Also, did the issue start after a Windows update or after connecting any new device recently?
Besides the earlier recommendations, you may find these additional options helpful:
Option 1: Start Windows Recovery Environment
- Turn the PC on and force it off when the Windows logo appears
- Repeat this three times until Automatic Repair appears
- Select Advanced options
Option 2: Run Startup Repair
- Go to Troubleshoot > Advanced options > Startup Repair
- Allow the repair process to complete and restart the PC
Option 3: Check for recently installed updates
- In Advanced options, select Uninstall Updates
- Try uninstalling the latest quality update
Option 4: Use System Restore if restore points are available
- Go to Troubleshoot > Advanced options > System Restore
- Select a restore point from before the issue began
If the answer is helpful, please click "Yes". If you have extra questions about this answer, please click "Comment".
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