I recently had to reinstall all the programs on my PC and began having a problem similar to this one. My Garmin Etrex Venture HC would be communicating properly, and the USB connection was fine, but when I picked "send to GPS" as an option it would only read, "not working properly...?". SO FRUSTRATING. I finally installed Internet Explorer 7 and it worked perfectly, it only took me 3 hours. i hope this helps some people! -Maxpower