I'm new to this fun, and am computer-challenged, but I love my new Garmin 60csx. Got it for a birthday. Anyway, I loaded MapSource and eagerly downloaded a NC map from this site. No lu ck. Couldn't use it. Deleted it & then had immediate problems with MapSource. After nights of uninstalling all of it and reinstalling, I took time off from work and contacted Garmin. After digging deep into my computer (over the course of an hour), the tech discovered that the one map I downloaded was the cause of the grief. It was interfering with my (old) version of MapSource. Admittedly, I installed MapSource, ignorant about required updates that also had to be downloaded. Question: I sorely want to dowload topos for my walking enjoyment, but am reluctant to repeat this fiasco. Can anyone shed light on the problem and possible fixes?