Ah right, thats good then. Most laptops I've seen don't have any expansion slots like that
Well... hmm... did it used to be slow? Or has it occured slowly? Have you ever tried running cleaning apps? Defragging the hard drive? Or if worst comes to worse, you could try re-installing windows, though you'd lose data as you'd have to format.
That brings into light another problem of course though, that some laptops don't come with a full installation of Windows on CD, so you'd have to use the recovery CD that came with it, which will set the harddrive back to factory settings.
You might find one of these suggestions help you. Note while running defrag, run it in safemode (f8 at bootup)