Brushes - Anyway to save them?

Ok, this happens to me quite often and I am sick and tired of it.
In Photoshop, I could download a bunch of brushes and put them on. I normally just download the brushes, save them all in a file on my computer, and drag them over to Photoshop. That's how I put my brushes on.

Then, the very next day, I could turn on my computer and all the brushes I recently downloaded would be gone. Yet, some would still be there.

Does anyone know why this is? I mean, I really hate going to site after site and re-downloading the brushes.

Help!

OH, and the memories has nothing on this. D: