NAVI PROBLEMS

cannot read disc check dvd
so after a month or so I decided to take it to the dealer (oil change etc)
They told me I needed a new disc $280
I told them no thanks.
After getting the car back I checked the navi a week and notice.

so I checked the disc and its still my orginal disc it just doesn't work anymore.
At lease before I went to the dealer the navi worked just not all the time. (no scratches)

so I called the dealer and asked them what's up, there response was I have to buy the update disc nothing they can do.
My question is there a way I can get my old disc to work? (downgrade software)
Is there a cheaper disc? where and how much?

http://www.navigation.com/is-bin/INT...gationMenu=YES
I have also heard that there are torrents of this content, however cannot confirm same nor countenance such activities....
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I'm having this same error whre only my nav does not work, everything else does. Before I give up and buy a Dynavin unit http://www.dynavin.com/products/product_dnv_mbc.php, anyone have experiance with this? I'm not having the update disc issue since I already have the 2010/11 disc.
Garmin w/ lifetime traffic and map updates= $140.00
Crap-tastic Merc-Nav w/ updated disc= $80.00 + shipping and it still sucks.










