I am looking to upgrade my mothers computer. I have never upgraded to a higher cpu before. Is it possible to take a emachine and swap out the processer, saya 366mhz for a 500 mhz. She has a 366i.

try looking to see who makes your mother board then search google for the makers website for info about your motherbosrd

Ok, well the 366 thing. Checked into it, and it would appear you have a Celeron 366 in your emachine. Check it to make sure (open up and look!). Anyway. Found this little site. http://www.thetechzone.com/articles/c366/ Your Celeron might be able to be overclocked to 550mhz+ without any real problems! I know that the early Celerons were ridiculously under clocked and they ran at FAR faster speeds than their "rating" said. Go to the link, and look into it. It is a FREE upgrade, and on such a low Celeron, I would totally suggest seriously thinking about overclocking. Otherwise, you have a socket 370 chip I believe. You NEED to make sure though. And you need to get a socket 370 chip that your board will support ( go for the maximum! ) Pentium 3 is a possibility. Look into it.