You sure that you built this computer? OK, let's get serious
To uninstall the USB drivers: Enter Device Manager, click on the plus sign at Universal Serial Bus Controllers. Double-click on each item listed that has "controller" in it, move to the Driver tab on each and uninstall the respective driver. http://www.evga.com/support/drivers/default.asp?switch=2
The above link contains access to drivers/documentation for your motherboard. My suggestion is that you download and read any manuals that relate to your board...you may need that knowledge later.
You may either just use the driver install CD which came with your board...or you can download new drivers from the site above. Install same according to instructions which may be contained.
In the absence of instructions, How to update a Windows hardware driver - http://www.bleepingcomputer.com/tutorials/how-to-update-a-windows-hardware-driver/
Procedures for updating/installing drivers are basically the same.