Refer to the Prerequisites.txt file available to download on the same page for OpenChoice desktop. Make sure you have all the prerequisites specified.  Prerequisites 1. PC equipped with  Microsoft Windows 7 32 Bit and 64 Bit OS, Windows 8.1 32 Bit and 64 Bit OS, 4GB RAM or more.  2. Connected by GPIB, USB, RS232 or LAN to a compatible Tektronix Oscilloscope .  3. VISA (Virtual Instrument Software Architecture) must be installed on the PC for OpenChoice Desktop to work.  4. This version of OpenChoice Desktop requires TekVISA v 4.1.0 or higher to be installed on the PC.   5. Tektronix USB Drivers for THS3000 Series Oscilloscopes must be installed on the PC for OpenChoice Desktop to communicate to these oscilloscopes.  *OpenChoice Desktop communicates directly to THS3000 series oscilloscopes using Serial Port and does not require VISA. Helpful Links OpenChoice Desktop + Prerequisites.txt Link: https://www.tek.com/oscilloscope/tds210-software/tektronix-openchoice-d… TekVISA https://www.tek.com/oscilloscope/tds7054-software/tekvisa-connectivity-…