I work with PT but I don't remember how about the plug in folders. AFAIR I think they are automatically placed on Program Files or so.
Altough I remember one of my first install trying, I couldn't see any plugs on pro tools. I needed to reinstall all the software.
Sorry I can't help well
Roland Promars. E-mu EMAX I and II. Access Virus TI Snow. Yamaha DX7, DX7 II FD, DX27S, Roland JP8000, D10, JX-8P. Korg POLY800, DW8000. Casio CZ1000, Casiotone MT-70, SK1 (lost in my house), Commodore C64 w/ prophet64. Akai S3000 XL HD. KURZWEIL PC1x