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Hello, I am new and have a problem loading New Mexico Topo.  After downloading NMTopo from your site to my computer, I get a blank map screen on MapSource.  And sometimes it says I need to reload MapSource which I tried to do a few times, but got the same message.  And always after trying to load that map my desktop icons are moved to different locations on my computer screen.  I MUST do a system restore to get everything back to normal.  I don't have these problems with Texas  Topo.  Any advice?