The ideal end-user fix shouldn't prevent other devices from using the usbhid driver.

Invelos Forums New User Barcode Scanner

Have you tried taking the battery out of the scanner and then reinserting it? It really depends which barcodes you scanned in the manual.

BarcodeReaders - Community Help

With some more googling I found an alternative available here --asifanwar98 If your QS6500 is not detected as a USB device then you have to confure the Interface Selection first to "USB Keyboard".

Acan Fg-8100 Manual

Your best chance seems to be a reset to the orinal settings, for which you may need to look at the manual.

Acan ccd barcode reader fg 8100 manual:

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