432MHz is extremely slow for running WinXP. You can upgrade, but it sounds like your system is pretty old, and the motherboard is likely imcompatible with some of today's faster CPUs. \n\nThe good news is that you can get a pentium 4 CPU for under $150 and compatible motherboard for well under $100.00. It doesn't make too much sense to have that much memory paired with such a slow CPU.\n\nOn the other hand, you might want to keep in mind that Microsoft is coming out with Windows Vista, their newest operating system, this November.