Shortcut and sticky keys are possessed

Hello,
I have a brand new dell Inspiron laptop that has the latest version of firefox on it and Windows 2007. I do not use the Microsoft 2007 works that is available, I have XP. My problem--I have turned off ALL of the sticky, shortcut, filter, everything keys and yet when I am typing things will happen like bringing up a new document or a spell check or completely shutting down what ever program I am in. It happens with ALL of the applications that I use, not just online, but when I am using a document on my desk top or anything. It has literally happened in everything that I have used. I am a fast typist and I have the speed of my keys as fast as they are allowed, but why, why, WHY do I have these annoying supposed "shortcuts" popping up in the middle of my typing? My husband has watched my typing, no I am not accidentally hitting the mouse pad, the control key, or windows key. This has been happening ever since I got this laptop a couple of months ago. This is very annoying!