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?