Posted April 27, 201014 yr I have an usb benq scanner s2w4300u and I installed it many times before and there was no problem at all, last time whn I connected it and was trying to install it I got failed, I always receive the message "the class installer has deied the request to install or upgrade this device" I tried many solutions such as uninstalling all USB drivers, removing all usb peripherals connected to the PC, installing new drivers for that scanner,... I hope to help me thanks, Ali El-Matarawy
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