Hello Susana,
Could you try the attached driver installation procedure for WIN7? We have tested this on the TSW3003 EVM (with DAC5687+TRF3703) on WIN7 and USB driver installed correctly.
Regarding the SPI programming directly from the FPGA to the DAC5687EVM, the EVM does not have an external direct connection to the SPI port of the DAC5687. If you really need to do so, you may need to remove U4 and solder down blue jumper wires from your FPGA EVM to pin 18, 16, 14, and 8/17 of U4 location.
-Kang