Slowness

My computer has been acting weird lately. It's kinda slow. The internet is speedy, but when I try to go from Mozilla to a word document or something, it seems to get confused and freeze up a bit. I think it has something to do with RAM, or memory or something. The hard drive is no where near full, so I know it's not that.

Maybe we can get some Dell memory, or more RAM and fix it? Anyone know anything about computers? I can work on a computer, but when it comes to working IN a computer.... you got me!