Well, if it only has one stick of RAM, you won't. There should be a panel on the bottom of the laptop with a screw. If you take off that small cover you may or may not have a second stick of RAM in there. THe problem is that this is a very general hardware Stop error. You might try uninstalling the printer if you can get it to boot, even into safe mode. Something may have gone awry there.
As far as reinstalling Windows without reinstalling everything else, you might try this tutorial to go through a repair - http://www.informationweek.com/showArticle.jhtml;jsessionid=STKGFAI0KVUKAQSNDLPSKH0CJUNN2JVN?articleID=189400897