I can format the card from the phone. I can save pictures to the card from the camera app. The phone sees the card properly. When I plug in the pc usb cable I select "disk drive" but the drive doesn't show up on the computer. Sometimes I see the drive (Drive G) pop up for a split second then disappear. Sometimes it never appears. I always get the "choose a connection type" message and select disk drive. The notification bar shows "USB DEBUGGING." I have tried it with USB debugging off or on. I have also installed HTC SYnc but that didn't help (and doesn't connect). Computer says "USB device not recognized." It always worked fine with my MyTouch 3G. There is nothing amiss in device manager. This is Win 7 64Bit. What drivers am I missing?