If you show the Device Manager are there any devices that are not working properly?
Your motherboard has 12 USB 2.0 ports. 6 on the back panel and 6 via headers on the motherboard. These should work with the chipset driver.
Your motherboard has 4 USB 3.0 ports. 2 on the back panel and 2 via headers on the motherboard. These should work with the VIA USB 3.0 Driver".
The USB 3.0 ports may not work right off until their driver is installed. You will notice that in the Device Manager. If that is true then stick with the USB 2.0 ports until the VIA USB 3.0 driver is installed.
Are any of the USB ports working? According to the manual they should be enabled in the BIOS by default. If none of the them are working you may have to install the chipset and USB 3.0 drivers for them to work. If you have the drivers on a USB stick but none of the ports are working can you at least get to the internet? If so you can email the drivers to yourself and get them to the computer that way.
BTW, do you really have 2 8GB sticks of RAM? If so why are you installing a 32-bit version of Windows 7? Windows 7 32-bit can only use at most 4GB of RAM. The rest is wasted.