You have a total of 1024 MB or approximately 1 GB of memory in your computer, but also it has windows vista home premium as its operating system. Vista eats alot of system resources, and to be able to get the most in your laptop, you need to add more memory on it. The max, amount of memory that your laptop can be able to handle is the most memory that you need, i guess you need to upgrade to 2 X 1 GB of memory with the same speed as the one that you have which is "DDR2 PC2-5300 • CL=5 • Unbuffered • NON-ECC • DDR2-667 • 1.8V • 128Meg x 64" .Kingston, crucial or corsair are some of the manufacturers that makes memory and you just have to shop wisely by going to different webstores and check their prices. Newegg.com, Tigerdirect.com, geek.com, circuitcity.com, bestbuy.com and compusa.com are just some of the webstores where you can get into and check the prices. Its your decision to make , I just give you an idea where to you can shop to buy for one. But be sure that you are buying the specs that I put in quote because this is what your computer is compatible with.