Hi,
Thanks for reaching out to the Microsoft Community and for sharing all those details. Just to clarify, when the keyboard stops working after you switch accounts, do the mouse and other USB devices still work, or do they stop responding too? This will help us figure out if the problem is limited to the keyboard driver or if it’s something affecting the entire USB/HID system.
In the meantime, here are a few things you can try:
First, check that the HID services are running. Press Win + R, type services.msc, and hit Enter. Look for Human Interface Device Service and Device Install Service, and make sure both are set to Automatic and running. If they’re stopped, start them.
Next, try reinstalling the keyboard driver. Open Device Manager, expand Keyboards, right-click your Microsoft Ergonomic Keyboard, and choose Uninstall device. Restart your PC so Windows can reinstall the driver automatically, or download the latest version from Microsoft Accessories.
You can also disable Fast User Switching, as it sometimes causes conflicts. Press Win + R, type gpedit.msc (if available), go to Computer Configuration - Administrative Templates - System - Logon, and enable Hide entry points for Fast User Switching.
If that doesn’t help, test with a clean boot. Run msconfig, go to the Services tab, check Hide Microsoft services, and disable the rest. Restart and see if the issue persists.
Another step is to check the registry for HID permissions. Go to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\hidserv and make sure the Start value is set to 2 (Automatic).
Finally, try creating a new local account instead of a Microsoft account and see if the keyboard works there. Go to Settings - Accounts - Other users - Add account - I don’t have this person’s sign-in info - Add a user without a Microsoft account.
If none of these steps fix the problem, it could be a corrupted user profile or a driver conflict introduced in Windows 11 25H2.
Hope this helps! If you need more clarification, feel free to post
back.
Regards,
Edward