I have a MkIII system that I tried to update to V27 it won't take it so, I read somewhere else to use V22 I downloaded it and burned it at 2X it goes through the complete installation process but it never says to remove cd and put in map cd. I have let it sit in the 100% complete process for at least 15 mins. When I try to put in the map cd it is a black screen. It doesn't ever fully load the software. HELP!!!!!