This Means.
You need more Ram if your only runing with 128 chip than you have no more ram to run your pc at full speed and if your runing Windows XP Sp2 than that it self take's over 128Mb of ram so you need to get your self some more ram.
You can find them at staples or Newegg.com or Best Buy A little tip if you are going to get your self more ram i would take it with you to what ever place you get ram from so you get the right one because if you dont get the right one is screws up your video and your computer will not work.the chip's go from 256 at 60$ 512 chip At 80-100$ 1Gb chip at 100-150$. most computers have three ram slots you can go cheap and get two 256 and put two more in that will give you 640mb or 512 and that will also give you the same if you keep that 128 chip you got.