SOFTWARE--- Minimum Requirements: ArcExplorer 2 (free download www.esri.com) works on Windows 95/98/2000/NT/ME/XP operating systems, or ArcExplorer 3.1 works on Windows NT/98/2000, or ArcExplorer 4 (java edition) works on Windows 98/2000/NT 4.0/XP.
Recommended requirements: ArcView 3.2a works on Windows 98/ME/NT 4.0/2000/XP--Home Edition and Professional , or ArcView 3.3 works on Windows 95/98/SE/2000/NT 4.0/ME/XP--Home Edition and Professional, or ARCGIS 8.1 works on Windows NT 4.0/2000, or ARCGIS 8.2 works on Windows NT 4.0/2000/Xp--Home Edition and Professional.
COMPUTER----- Minimum Requirements: Platform PC-Intel, Memory 128 MB RAM, Processor 450 MHz., Hard drive 4 GB Recommended Requirements : Same as before except for replace Memory to 256 MB RAM (or higher), Processor to 650 MHz (or higher) and Hard drive to 40 GB (or higher). Other Recommendations: Fast Disk (e.g., SCSI), OpenGL card for use of ArcGIS 3D Analyst.