make sure to unplug computer before installing ram just to be safe .and ground youself before taking the ram out of the static free bag that it should be in when you buy it !

Doesn't sound to hard to do,so if i wanted to go and put 512 mb into my system would I just go to the store and buy the 512 mb there?Or does it have to be a certain one to match the 128 I have in my system?

My System is....

AMD Athlon XP 1600
1.39 GHz
128 MB off Ram

Motherboard,I have no idea what it is,is there a way to find out?

Thanks,
Ally

You really need to know the board ,so you can find out just what kind and how much it can take and in what combination
You can find this out by opening the case and look on the mothere board for a name and or number .