PS I imagine a lot lot of people [me included first time], when increasing memory they just add more of what is already in there, a simple increase in capacity. Then later a memory intensive progam is installed and even that increase isnt sufficient. My advice is to check first you have max speed memory fitted in the first place [unlikely unless you specified this requirement when you purchased your PC]. If it is, good luck, and increase to more than 512mb if you can as XP takes a large chunk of that to run smoothly. If not, bite the bullet and change what you have for the fastest recommended by your mobo and increase the capacity to 512mb+ You will see a big difference in performance.