1. Start Registry Editor (Regedt32.exe).
2. Locate the UpperFilters value under the following key in the registry:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\{4D36E965-E325-11CE-BFC1-08002BE10318}
3. On the Edit menu, click Delete, and then click OK.
4. Locate the LowerFilters value under the same key in the registry:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\{4D36E965-E325-11CE-BFC1-08002BE10318}
5. On the Edit menu, click Delete, and then click OK.
6. Quit Registry Editor.
NOTE: After you remove the Upperfilters value and the Lowerfilters value, if you notice lost functionality in a particular program, such as CD recording software, you may need to reinstall that software. If the problem recurs, consult with the software vendor for assistance.
7. Restart your computer.

Code 41
Windows successfully loaded the device driver for this hardware but cannot find the hardware device. (Code 41)


Recommended resolution


A driver was loaded but Windows cannot find the device. This error occurs when Windows does not detect a non-Plug and Play device.

If the device was removed, uninstall the driver, install the device, and then click Scan for hardware changes to reinstall the driver. If the hardware was not removed, obtain a new or updated driver for the device.

If the device is a non-Plug and Play device, a newer version of the driver might be needed. To install non-Plug and Play devices, use the Add Hardware wizard. Click Performance and Maintenance on Control Panel, click System, and on the Hardware tab, click Add Hardware Wizard.

On the General Properties tab of the device, click Troubleshoot to start the Troubleshooting Wizard.