Sony VAIO VGN-S460 Notebook "scr mean" Questions

...that my Fn key does not work. All the keys that i can use for sound, lighting, monitor, sleep and scr Lk cant be used. Didnt know what happened... Tnx! check under your "processes" in the Windows ...

...I'd like to upgrade the memory of my laptop. One of the memory slots is easy to get to (couple of screws to remove on the back of the computer), but I can't find any information about how to access ...