[Tweakhead]

IMHO you should do a clean install.

Real Player puts so much crap in your system folder, you should avoid it if at all possible.

Ideally partition your system drive. Do an install of OS9 on each. Keep one totally clean for your ProTools setup, and then use the other for all your other installs of Real Player and other system abusive programs.

Of course if you do a partitioning of your drive, deauthorize everything first...backup all your data...initialize the drives with DriveSetup and partition the drive. Then do the installs of your software.

Remember that when you install new software it will put any system stuff into the partition that you are currently booted from.