At least you do have a dual core, that is better then I thought. My AMD Athlon was a single core. Perhaps it's possible to add a little more Ram so you get 4 gb and add a better graphics card? That shouldn't cost too much and takes you a long way.

Artwork and 3DToons items, create the perfect place for you toon and other figures!

http://www.renderosity.com/mod/bcs/index.php?vendor=23722

Due to the childish TOS changes, I'm not allowed to link to my other products outside of Rendo anymore :(

Food for thought.....
https://www.youtube.com/watch?v=pYZw0dfLmLk