I don't know all that much about computers.
But make sure your system can support more RAM, what that figure is, and what your operating system can support.
I think xp is only good for up to 3gb....not sure though.
Your processor speed may factor in as well.
But RAM is easy to install for most folks and the suggestions here should get you on your way. Crucial's web site is great for plugging in your system make and model number and showing you what is available and compatible.
If someone were to ask me what has been my biggest accomplishment in life, I would lift my head high and speak from my heart with a parent's pride as I said the words "my son."
Andrea Adaire Fischer JNT120706