The minimum hardware requirements for Windows XP Home Edition are:

    Pentium 233-megahertz (MHz) processor or faster (300 MHz is recommended)
    At least 64 megabytes (MB) of RAM (128 MB is recommended)
    At least 1.5 gigabytes (GB) of available space on the hard disk
    CD-ROM or DVD-ROM drive
    Keyboard and a Microsoft Mouse or some other compatible pointing device
    Video adapter and monitor with Super VGA (800 x 600)or higher resolution
    Sound card
    Speakers or headphones

 The minimum hardware requirements for Windows XP Professional include:

    Pentium 233-megahertz (MHz) processor or faster (300 MHz is recommended)
    At least 64 megabytes (MB) of RAM (128 MB is recommended)
    At least 1.5 gigabytes (GB) of available space on the hard disk
    CD-ROM or DVD-ROM drive
    Keyboard and a Microsoft Mouse or some other compatible pointing device
    Video adapter and monitor with Super VGA (800 x 600) or higher resolution
    Sound card
    Speakers or headphones