you didnt post your computer specs.
if your overall computer is to far behind in technology then adding ram and video cards will only show a small performance gain.
if you are using an onboard video card and goto a dedicated card then you will see a performance gain depending on the card.
if you have 256 or 512 megs of ram at the moment and running XP adding a little more will improve speed slightly when running programs that require a little more ram.
you should post your computer specs however to get a proper evaluation.
we cant guess what rig you have.
If no-one gives your an answer to a question you have asked, consider:- Is your question clear.- Did you ask nicely.- Are you showing any effort to solve the problem yourself 