Adding plugin for Photoshop CS3, but not active when I re-install Photoshop CS3 on my new computer

Hi !

I added files with the 8BF exention (plugins) in photoshop CS3 plugin which worked fine on my old computer. By re-installing Photoshop CS3 on my new computer, the plugins show up in the Filter tab, but they aren't active. Do you know why ?

At pleasure to read you