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Uninstall both versions. If you get errors or can't uninstall, use the Microsoft Installer Cleanup Utility to remove traces of Reader.
Once finished, reinstall ONE version of Reader.
With Vista you only need Reader 9. Do not attempt to install 4.0, it is
not compatible with Vista. It is probably not compatible with XP.
I was afraid of the 4.0 not being compatible with Vista. I DO know that the 4.0 works on XP because my boss was using the disks that need 4.0 on a laptop that has XP on it. The laptop is SOOO Slow that he'd rather use his new computer but he may just have to dump a bunch of stuff off of the laptop to speed it up and use it for his manuals ONLY.
Another quick question though....shouldn't you be able to view PDFs that used 4.0 on 9.0 or are they so far apart that the new can't read the old?
You should be able to view old PDF documents on Reader 9.