EasyHID 18f4550 - DEVICE NOT RECOGNISED?

Hi, Pic-friends

I'm a new user of this forum.
I have a problem with EasyHID.
I tried to program the PIC18f4550 with the default code generated by EasyHID to test if the USB connection works.
I used 20 MHz crystal.
I programmed the pic by winpic800.
But When I connect it to USB Windows reply with the message "Device Not Recognised".
I used the circuit configuration suggested by EasyHID.
I tried many fuse configuration (using the datasheet of 18f4550).
Anyone knows how I can solve this problem?

Thank you,
Zietto