I posted this issue here recently as well, but have still not been able to resolve it. I don't think the issue lies with the pedals, or as a hardware issue with the computer. I have no issues with any other USB devices, except TC Electronic Toneprint pedals. As far as I can tell, the issue lies with Windows 7 not loading the device drivers from the pedal. I may relate to some permission setting, but that is just conjecture. The common element, however, is that Win7 sees the pedals and recognizes them as USB audio devices but for whatever reason will not load the drivers. Thankfully I still have an old XP machine, but it is pretty inconvenient and I really hope a (simple) answer is found. Especially with the Windows app store (hopefully) on the way soon so I can buy some more algorithms.