I assume you have tried the following simple trouble shooting methods, but I'm going to list some anyways just in case.
- Unplug and replug the devices
- Try every usb port on your system and note which ones work and don't
- Try any and every other usb device you have on all usb ports.
- Remove old drivers, install new drivers
The goal, try to eliminate variables. Sometimes you have to multiply x on the top and the bottom so they will cancel out. =)
Install all hardware
turn off antivirus and firewall, ALL security OFF
set the bios to boot CD DVD drive first
Put win 7 disk in the drive, start the computer
this reloads the OS, and configures the hardware.
But it does not erase your personal files or programs.
Your hardware is not configured.