revWebInstaller Installation On Windows Confusion

[Eddie]

On the Windows platform I use a regular user account for day-to-day use 
and elevate my privileges to "admin" as necessary for software 
installations, maintenance, etc.  I installed the revWebInstaller as the 
"admin", but when logged on as the "user" none of my web browsers 
(FireFox 3.5 and IE7) saw that the plug-in was installed (i.e. same 
prompt appears as if you do not have the plug-in).  Logging in as the 
"admin" works just fine and that account sees the plug-in as being 
installed.  I ran revWebInstaller under my "user" account and things 
seem to work properly now, but I am confused by this behavior.  Is the 
revWebInstaller supposed to "install" for just the user who runs the 
installer or all users?