DON'T BUY IT!.
I've been trying to get it to work for 3 days, and always loads with errors.. tons of research and time used to figure it out the problem and nothing works.
I contact directly to FF and follow all their instructions or re installing MV C++, Java, deactivating my Anti virus, re installing the B777 folder and still loads with errors saying that is missing the "de.philippmuenzel.t7avionics missing plugin" and "FF mouse handler missing plugin" which in fact, ARE on the folders.
Its a great plane, but be aware that you may have the same problem as I have, and risk 85 bucks for it!!