Apps :: Error when Installing Apps



Ok I've used a couple versions of Linux but I'm having trouble installing apps with DSL-N.  I opened the DSL-Control Panel, went to Testing, and downloaded Firefox.  When the download finishes I get a message that says:
Code Sample
Please mount media containing optional dir and try again.  


I've gotten this message with different applications too. I've tried mounting hda1, knoppix.swp, cdrom, fd0 and none of these seem to change this. (Btw I'm trying "mkdir /mnt/cdrom/" to try these) What do I need to do?


original here.