Change permissions?

here is the story:
I had a five year old G5 with freezing/crashing problems,
so I just got a new 2xquadcore intel G5.
I took the hard-drive from my old G5 and put into my new G5 ,for back up in the future and also to transfer bookmarks, files, mail addresses etc.
Now most of the folders ( pictures/music/documents basically all the folders which I didn't name myself) on my old HD are not accessible ( showing a red sign with a minus inside)
I think it has to do something with permissions.
Can I chance the permissions on my old HD when it is installed in the new G5 or how do I go from here?

Cant he mount the drive then right click it and select "get info.At the bottom add his user name to the list (as admin : read & write)? Also if you do do this, you need to click the button to the right of the "-" ... looks like a gear with a down arrow and include all files on this drive.
Im actually having to do that now while creating a new user.
Hope either one of these post helps.
Message was edited by: efxgraphx

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    Message was edited by: Thor Stevens

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