Ugh. This is all broken for me too.
W7 won't let me run those reg fixes from the desktop, it says
"The specified file is not a registry file. You can only import binary registry files from within the registry editor"
So, I imported them into regedit, but it bombs out with the same error. Note that the files are .reg files, they have the correct filetype icon.
I'm stuck without cPBO now. I tried armaunpbo, but that's clunky to use, compared to cPBO and it doesn't actually do anything, when I click extract in it's interface.
Thank goodness for PBOView! That works, I'd rather use cPBO though.