Tieling, The easiest way to see any of your current driver versions is to use Measurement and Automation Explorer (Start >> All Programs >> National Instruments >> Measurement and Automation) In the left pane, under My System, you will see "Software". Expand this and in the list, you should see NI-HSDIO if you select this you will see in the right pane the exact version number that you need. To get the latest HSDIO driver, or any driver, go to <a href="http://www.ni.com" target="_blank">ni.com</a> and select Support and Community on the front page. Under this you will see Drivers and Updates. From this you can browse to your driver by category, or simply do a search. If you search for hsdio, you will get a list of different driver versions. To get the latest, select Version in the Sort by: drop down box. This will sort the list from highest version to lowest. Right now, 1.5.3 is the latest driver that we have available on the web. However, if you have the latest driver CD, this will come with HSDIO 1.5.4.