OK... I have the above mentioned PC. I'm looking to upgrade my 512Mb RAM to at least 1GB so I can play more games and get better performance. I had picked out some memory and then was told that my PC isn't DDR or DDR2 compatible. I'm just illiterate enough to not know exactly what I'm doing. How would you recommend fixing this issue? Do I need some new piece of hardware so that I can upgrade or am I stuck w/what I've got? Any help would be appreciated. I'm not sure how to get my PC info here, but can email to anyone in a MS word document. Thanks all.