If you're using Looks, make sure you've got the latest update - 1.2
Which Magic Bullet plug-in?
What operating system?
What other MB/Trapcode plug-ins do you have installed?
Any other third party add-ons?
How do I locate the file 'Looksbuilder.exe'?
Also installed Sapphire and Tiffen with no problems.
However, I am now getting an anoying chime when I open Premiere CS4 and don't know how to get rid of it.
Mick - I assume your using Magic Bullet Looks?
If so, couple things - as I posted earlier, make sure your running version 1.2...if not, go to Red Giant Software's website and download that version.
Also, Red Giant makes some great plugins, the only thing is they are sometimes really picky about the hardware that runs them. I've heard about some video cards not playing well with them and causing problems. If you can list some details about your system, that may help in finding the issue. I run Looks with CS4 all the time - use it a LOT - and I'm not having any issues with it.
You should be able to go to Start>Programs and navigate to Magic Bullet (maybe Red Giant), then find it in the fly-out menu, IIRC.