How much gb or mb i need to upgrade our RAM because our computer is so slow and it also affect our internet connection? (for Windows xp 2000)

2gb will improve it considerably 4 is better .

thank you for the answer mr. rasputin,, it will help a lot!

Well it depends on what your computer can support, im assuming you have a 32 bit OS, which wont support more than 4 gigs of RAM. And its not always the RAM either, try cleaning up some files and maybe even a fresh install.

Double the amount it came with.If it was 512 mb, drop in another 512...anymore than double the original may cause problems.