Isuse getting any games to run

[theranker]

hey guys
so i have ISOs of wii games..
i have Dolphin SVN R 1137 ... thats wht it says
i have windows vista 32 bit. ultimate.. sp2.
AMD duel core 2.4 ghz, 1.5 gb ram.

any iso i load.. will give me an error of...

cant open wii/masterkey.bin
invalid iso file.

all were made from orginal disc's backedup onto harddrive in iso format.
any ideas whats going on? i followed the configuration on the stickys.. and checked out a few things.. but i cant seem to load any of hte backups i did... none...

any help or suggestions would be greatly appricated. thanks

edit.... by the way. .they are all NTSC games. no pals.