Do you have drivers for the motherboard try re-installing them if you do. You should be able to select the usb drivers off a disk. Alternatively go to device manager and check if the usb ports are installed properly. They will have a yellow ! next to them.If you have a disk of drivers stick it in and double click the yellow !. There should be a tab that says drivers, click it and then click reinstall driver and chose the i have a disk option it should find and install!!!!!!