I agree with Elite in this situation. You could get an quality system for $200-$250 these days. Just ask
In response to your question, you memory is DDR2, which is easily upgradeable.
http://www.newegg.com/Product/Produc...82E16820211059
You could upgrade you CPU to an Pentium D. Anything with 800FSB...
http://www.intel.com/products/mother...5Gtp/index.htm