Is it Possible to upgrade my Computer?

<p>go to any site that sells parts and build your own pc, it would come out to about 150 - 400 depending on parts. Or go to bestbuy or something and get a emachines deal, my sis got a deal for 350 and go a very nice pc, moniter, speakers and printer free (3.0ghz sempron AMD, 512mb ram).</p>