I found this tip looking for something else, at it help dramaticly in reading .PDF files found on the Web.
Look in C:\Program Files\Adobe\Acrobat 6.0\Reader
(This is for Adobe Reader 6, but works for Reader 5 as well)
Create a new folder called "Optional" if it does not already exist.
Now go to: C:\Program Files\Adobe\Acrobat 6.0\Reader\plug_ins
Move everything to C:\Program Files\Adobe\Acrobat 6.0\Reader\Optional
Done. If Adobe Reader really needs a plug-in it will find it by itself in the Optional folder.
Look in C:\Program Files\Adobe\Acrobat 6.0\Reader
(This is for Adobe Reader 6, but works for Reader 5 as well)
Create a new folder called "Optional" if it does not already exist.
Now go to: C:\Program Files\Adobe\Acrobat 6.0\Reader\plug_ins
Move everything to C:\Program Files\Adobe\Acrobat 6.0\Reader\Optional
Done. If Adobe Reader really needs a plug-in it will find it by itself in the Optional folder.