Does Windows see the device in the Devices and Printers control panel without error? Usually it is listed as unspecified input device. You can right click the device to check properties. If you have a yellow triangle with "!" inside then the windows USB driver is having a problem talking to the Acurite device. If you have an error you can unplug/re-plug USB cable until no error is seen. Or you can go to device manager and make sure there are no errors under USB controllers then look under Human Interface Devices(HID) for "USB Input Device". If there is an error you can right click then disable device and then enable device until you don't get an error. This simulates unplugging then re-plugging USB cable. It may only take a few tries or many tries, but Windows will eventually see the device without error. At this point the Pc Connect software should work, but sometimes it will detect wrong USB mode and fail then you have to disable/enable device in device manager again and try running Pc Connect again.