First he needs to make sure any old flash downloads are removed from the computer that he is trying to install the new versions to.

It can only be removed using the uninstaller program!
How to uninstall the Adobe Flash Player plug-in and ActiveX control

Then he needs to reinstall the flash player to the browsers for each user as reported by S-n-M.

Note*********** per, one of my and wombat's friends discovered that Ccleaner and also regscrubXP both would cause the flash programs to stop working as they both removed a (falsely reported broken pathe) registry link to the plug-in. In as such the whole thing had to be uninstalled and reinstalled to get it to work. One must be careful as to what a registry cleane removes.