Photoshop brushes dissapear.?

[Tigger]

I've downloaded a megapack of brushes 200mb, i've put them into the brushes folder and opened photoshop to load them (which took forever to do). My computer was running kinda slow and photoshop ended up crashing so i closed it. When i opened it back up none of the brushes were there, well, they were there but they wern't loaded. I tried loading them again, and it crashed again, when i opened it back up they were gone.

Does anyone know what's wrong? Is it cos photoshop keeps crashing?

And is there anyway to load your brushes all at once instead of just one set at a time?