Once your done installing your plug-ins in your administrator account, copy the profile to the Default User folder (in Documents and Settings \ Profiles). From there on, every NEW user to the machine that logs on will use the default profile to create the new profile, thus, having the plug-ins. Any existing profile must be deleted to force it to be recreated.
Will not work with Roaming Profiles, of course.. hehe.
"In space, nobody can hear you click..."