Keyboard Problem

I have a Dell Studio XPS laptop. My keyboard types the function with the CTRL key even when I dont press it. for eg. as I am typing T right now, the New Tab window was opening. same is with H (opens History) and F (opens Favourites). This inspite of me not pressing the CTRL key. I have run the diagnostics but the results were ok. Pls help asap. My computer is just a week old.