The system is not actually hung; you simply cannot interact with it. This is occurring because you have only USB 3.0 ports and the Windows 7 installation images are so old that they do not include USB 3.0 support. You have to gas-pump the USB 3.0 drivers into the Windows 7 installation images before you will be able to proceed. There are multiple threads in this forum that detail how to gas-pump the USB 3.0 drivers into the Windows 7 installation images. Do a search for "Windows 7 USB 3.0" and you will find them. Intel also provides a package for download that will assist you with this process.
Hope this helps,
This message was posted on behalf of Intel Corporation
Unfortunately, USB 3.0 drivers are not included on Windows 7 OS, so it is necessary to perform a workaround.
Newer operating systems Windows8.0/8.1 and 10 already include the driver.
Let me know if I can help you with anything else.