Are you running the 32 bit or 64 bit version of Photoshop?
You added the brushes to the 32 bit application folder.
(yes, it is weird to have 32 and 64 bit app folders - but that is what Microsoft requires)
I was able to get ahold of the customer service at Adobe and I needed to load my files with in %appdata%/Roaming and not on my c: drive. They are there now!
That location is more difficult for some people to find, but it has the advantage that it works for 32 and 64 bit versions of the application.