I don't think the problem is with the 7Zip unpacking. 'Greg' has already been advised to use either WinRAR or PeaZip, as alternatives in this specific case. Like that universal extractor ^, neither have any reported problem unpacking either of the two games' ISOs.
Whatever the problem is it is not, or should not be, with the unpacking unless for some reason 'Greg' has continued trying to use the 7Zip extracted ISOs rather than those done with PeaZip or another program.
