I have had my garmin etrex venture cx for several years, it has always worked well although i never plugged it into a pc. I tried this today using a pc with windows 7 but the pc doesn't recognise it. The GPS tells me it is now drawing power from the pc via the USB but no connection to the pc. Anyone able to offer any suggestions. Do I need a micro sd in the GPS? Is it a problematic connection? I have downloaded all the newest drivers to the PC from garmin. Cheers