Class driver doesn't supports the 64-bit Windows. The 64-bit Windows XP/Vista/7/8 and Windows 2003/2008/2012 User, Pease install the UniDAQ driver/SDK, Download site: CD:\\NAPDOS\PCI\UniDAQ http://ftp.icpdas.com/pub/cd/iocard/pci/napdos/pci/unidaq/ ftp://ftp.icpdas.com/pub/cd/iocard/pci/napdos/pci/unidaq/