Elena – I was having issues with my PC syncing and a guy I run with is as well after the last windows update. I ended up trying my watch at work with the Ant device and it worked fine. My computer at work is a Mac. I think somehow the latest windows update somehow has created issues, possibly with older computers. Friends computer is older as well. So, I can only sync at work. Annoying. My laptop at home is older. So not sure if that was the issue. I was having issues after bike rides with workouts syncing. With my mac it is all working. So I am not sure if the sync process uses a lot of horsepower. I noticed on PC the computer would say Garmin Express is not responding.