I have installed win7 beta on a 2nd hard drive called drive letter W: I have Garmin MapSource programs and map data on the main drive in drive letter C: which were loaded under XP. When I am running win7 and try to run the MapSource.exe program that is on C: I get an error: MapSource could not find any installed MapSource map products. In other words, the mapsource program did not find any installed maps. I thought or was under the misguided impression that you could run win7 and access and run programs that are on another drive or partition. I mean, does all my XP programs that I have on C: have to be reinstalled on drive W:? I thought this win7 could run any program on any location. What I think win7 should be able to do is to be able to switch to a particular selected drive or partition and run programs and access the data under that partition. Now it looks like I might have to reinstall all my MapSource programs and map data again on W: drive, which I didn't make big enough. I only allowed so much space just to install win7.