The links on mandriva.com assume you have BitTorrent installed and configured. You apparently don't, because your browser is trying to display the .torrent file instead.

These should work to directly download the files from that Illinois server listed there though. You only need either the CDs or the DVD, not both:

CD:
ftp://mirror.mcs.anl.gov/pub/mandrak...7-CD1.i586.iso
ftp://mirror.mcs.anl.gov/pub/mandrak...7-CD2.i586.iso
ftp://mirror.mcs.anl.gov/pub/mandrak...7-CD3.i586.iso
ftp://mirror.mcs.anl.gov/pub/mandrak...7-CD4.i586.iso

DVD:
ftp://mirror.mcs.anl.gov/pub/mandrak...e-2007-DVD.iso