Rather than try to do a custom install, which may screw stuff up, I'd
modify it post installation. Right click on a file that you'd rather were
associated with 2006, select open with, select "choose program", browse to
your sw 2006 executable, hit the checkbox to always use the program, and you
are good-to-go. When installing 2007 you will have to specify directories
other than those currently in use by 2006, or it'll overwrite toolbox data
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