c530 download issue (pain)

I have a new c530 and a new 2008 map noway can I get the download to work .I have regestered gps unlocked the map , this is what I end up with .THIS GARMIN UNIT IS NOT ELIGIBLE FOR THIS UPDATE BECAUSE A PREVIUS MAP VERSION IS NOT INSTALLED.OK this is where the fun starts phoned garmin they say no problem your gps serial# is not in our data base we will fix this on our end. Waited a week or so sill the same, this gps stuff is new to me .I read 50 plus posts picked out bits and peices of info . I have a c530 and a new 2008 map both are unlocked but will not work together, do I need mapsourse , better yet what is map sourse I would be satisfied with a canadian map that is up to date no more no less.This gps and map are new sept 28 07 gps update disc oct 10 07 at the sourse(radio shack).I would love to see a simple to follow step by step plan on how to unlock and load everything you need to be current 2008 update mapsourse unlock codes all in one place. Until then I will keep fishing in the dark .