Problem updating FC6 to F7 from DVD

Hi there.

I downloaded the F7-DVD (for i386) (image was burned correctly,
media-test was passed), but when I go for installation, anaconda breaks
up when loading the repository stuff.. It just tells me that repo
metadata couldn't be read for anaconda-base.

I'm quite.. lost at this point, 'cause I have no idea what has gone
wrong here. Anyone has an idea as where to look or how to get around
this?
--
fedora Core6 & XP Pro on 2,6GHz Celeron, 1GB RAM, 38GB HDD
fedora Core6 on 750MHz Athlon, 750MB RAM, 80GB HDD
FreeBSD 6.2 on 133MHz P1, 48MB RAM 1.4GB HDD
.