• 3 Answers SOURCE: I was successful installing a Casio Privia PX-575R USB midi keyboard to Windows 7 Ultimate x64!!! Hp Compaq 6820s Linux Drivers. I tried to use Yamaha, Korg, M-Audio, and some other drivers I don't remember and they did not work. I then downloaded the win 7 x64 driver for PC-50 from (but I bet any of them would work) from Roland. All I did was change the hardware ID in the INF file under [Roland.NTamd64.6. S Game Star Girl. 1];; Windows7%RDID0053DeviceDesc%=RDID0053Install, USB VID_07CF&PID_6802 The ID is after the comma and the one you see above is from the Casio keyboard i have. The hardware ID for your keyboard can be found in 'device manager'.