1. Download the program “USBDeview” from following site
2. Install USBDeview
3. In the program window, click the tab “ProductID” to sort drivers installed in your PC.
And select all ps2avrGB drivers (VenderID = 20a0, ProductID = 422d)
4. Click mouse right button and click ‘Uninstall Selected Devices’
4. Replug your keyboard