I installed a fresh version of Windows 7 Professional on the Optiplex 7440. However, the mouse isn't working - only the keyboard. I was able to get in the device manager and it seems the necessary drivers need to be installed. I put the drivers on a USB drive, but the computer will not recognize the drive. I also need to install the Ethernet Controller to get Network access. I am unable to get the necessary drivers on this computer since the USB ports will only recognize the keyboard. I'm not sure what to do. Do I need to change something in the BIOS? Please advise.
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