Hey everyone. So I got a free computer from someone as a gift. It is a really old desktop a HP Pavilion a1450n. I want to learn to work and build computers so I figured why not start with this one. I want to use older parts that will be compatible with it and try to upgrade it to run Second life without much lag. I was coming here for help to see if you guys could help guide me in the right direction. I have already upgraded from 2 GB ram to 4 GB ram. They pc runs at 60% usage and 100% usage pretty much on any given Sunday. What are some things I can do and parts I can change out to help lower the pc usage and be able to a graphics heavy game like Second Life. I want to upgrade the graphics card and power supply but I am unsure if I can use a new graphics card with this pc since it was made in 2007 or if I should try to find out what was the Best graphics card money can buy in 2007 and try to just use that lol. Thanks for any help I know this sounds weird but like I said it was a gift to me and I just want to try to make it better.