Basecamp on Win XP

I have a GPSMap 76CSX with some Topos loaded onto it. Just talked to Support and found that I can't transfer topo maps from the hand-held to Basecamp.
The topos originated on an old PC running XP and were loaded to the CSX via MapSource.
I've just gotten used to Basecamp and would rather work in it.
Anyone know if it will work OK under XP? I don't want to try it if it will screw things up <grin>.
Thanks!
LLOYD S