Thread: Extracting ISO?

So I'm downloading Dark Cloud 2 right now.
There's 29 parts and I've already downloaded part 1.
They are labeled .rar
I've made a folder on my Desktop called DC2.
I'm trying to extract the Dark Cloud 2 .iso's in there.
It gives me two options when I extract each part:
Process all files in all volumes from the current
and
Process selected file only.
After I press one of the options, I wait for the extration.
A minute later or so, an error appears and says: file is corrupt.
An hour later it says that i need all the parts.
Am I extracting wrong?
I'm going to wait for all the files to be done downloading and trying again.
But I want to try extracting one at a time. What should I do?

A corrupt file usually means that that file didn't download completely.
You need to download every part of the file set before you can even begin to extract the game.