I am sorry for your issue.
There is a possible workaround by changing the USB 3.0 or xHCI mode to Auto or Smart Auto in BIOS. With this setting the USB 3.0 ports are reconfigured to function as USB 2.0 ports using the native Windows* driver. Then, you may change it back after the operating system is installed and load the USB 3.0 driver.
The other option is to slipstream the USB 3.0 driver into the Windows* 7 installer. You may use this USB 3.0 driver, based on the specifications provided by the system manufacturer for your model.
For the slipstream process itself you may refer to these articles:
How to Speed Up Windows 7 Installs With Slipstreaming and USB | PCWorld
How to build a slipstream Windows 7 install disc | News | TechRadar