Some ideas:
- Do you have administrator privileges on the computer?
- Can you try on another computer?
- Disconnect the board. Then uninstall the ADF4355 software and the SDP drivers from Program and Features in Control Panel. Then, reinstall the latest software and drivers (link below). Then reconnect the USB board - Windows should install the drivers twice - allow 5 minutes. Then run the software.
Latest software and drivers: ftp://ftp.analog.com/pub/evalcd/ADF4355_CD/ADF4355_v0_39_0.exe