USB2FPGA is rather old and unfortunately there is no official support for 64bit Windows 7. If you are still interested in using USB2FPGA with Windows 7 64bit, please contact our sales team at sales@cesys.com with your full contact data. We then could give you a quote for implementing drivers supporting newer releases of Windows, including Windows 7 64bit.
Greets,
Michael Hufnagel [Dipl.-Ing. (Univ.) Elektrotechnik]
CESYS Gesellschaft für angewandte Mikroelektronik mbH Hardware- Entwicklung und Validierung