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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
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128 megabytes (MB) of RAM or higher recommended (64 MB minimum supported; may limit performance and some features)
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1.5 gigabytes (GB) of available hard disk space*
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Super VGA (800 x 600) or higher-resolution video adapter and monitor
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CD-ROM or DVD drive
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Keyboard and Microsoft Mouse or compatible pointing device
http://www.microsoft.com/windowsxp/pro/upgrading/sy sreqs.mspx