I HAD to take it to MicroCenter for new RAM and a Windows reinstall because when I got the system the ram was fried and the OS wouldn't even try to boot. I had no choice but to take it to a shop...
There are tons of tutorials and videos on how to change RAM (even though it's so goddamn easy), and we could walk you through the process if you needed it. If you can't do that I don't see why you're even asking questions here, just to Microcenter everytime you have the slightest problem...