Similar (ish) story, I got a watch with gps and stuff for data logging my training runs, after the first few downloads from it, the computer would recognise the fact that the watch was connected but failed to access the devices logs... I was initially concerned it'd developed a similar problem to my palm(i.e. never destined to connect via usb - I connect via serial now) although luckily the resolution was :-
1. Download new client software for the watch from garmin
2. Download new application software for PC
Hopefully you might be able to source some new driver software for your watch/PC that'll address your issues.
1. Download new client software for the watch from garmin
2. Download new application software for PC
Hopefully you might be able to source some new driver software for your watch/PC that'll address your issues.