Protools : plug-in directory location

Hello,

I have been using Protols 8 LE for more than 2 years now and I am having an issue right now. When I launch protools it asks me to locate a plug-in repertory and opens a window which is partly hidden behind the protools launching window. Even though I can grab it and move it I can't select anything; it makes this "DO" sound that comes when selecting is impossible.

What can I do ?

Thanks in advance.

Sacha