Here are the minimum requirements for Windows XP.But like Talldude said you should atleast run 256mb ram, 800mhz. I've seen xp fail to boot with less.
PC with 300 megahertz or higher processor clock speed recommended; 233 MHz minimum required (single or dual processor system);* Intel Pentium/Celeron family, or AMD K6/Athlon/Duron family, or compatible processor recommended
128 megabytes (MB) of RAM or higher recommended (64 MB minimum supported; may limit performance and some features)
1.5 gigabytes (GB) of available hard disk space*
Super VGA (800 x 600) or higher-resolution video adapter and monitor
CD-ROM or DVD drive
"Research is what I'm doing when it looks like I'm not doing anything" :D
BEER, is it in you?