If the installation has failed first please check to make sure that the version of the software you used is compatible with Windows 7.
If it was compatible but still the PC did not recognize the driver, please see the link below and try reinstalling the USB driver.
Reinstalling USB Driver on Windows 7
TR-7Ui Series, TR-7wf/nw Series, TR-50U2, TR-57DCi
November 21, 2016