If your copy of Windows XP is not a full RETAIL version, then you will have to add the cost of a new XP license to your CPU + motherboard upgrade.
I believe that my AMD Athlon XP2800+ is failing. I use my system mostly for Flight Sim. I do not want to do a full system upgrade till mid summer. I need a review of this plan: I plan to upgrade now with a Athlon 64 3800+ and use a ASUS A8N5X MB since this board will allow me to upgrade to a Athlon 64 Dual Core eventually. I want to re-install my Corsair TwinX 1GB DDR400 XMS3200 RAM, WD 120 GB SATA hard drive, and Radeon 9800np Graphics Card. My understanding is that the new FSX Flight Sim does not yet fully utilize the Dual Core CPU so I don?t want to go there yet. When I upgrade I would like to ad another identical hard drive. If I am thinking dumb, please break it to me kindly. I am certainly receptive to better ideas.