To use RangeMaster Pro II, you need: PC with a Pentium-class processor Microsoft Windows® 98 or later operating system, or Microsoft Windows NT® operating system version 4.0 with Service Pack 3 or later Microsoft Internet Explorer 4.01 Service Pack 1 or later CD-ROM drive (Unless you download) from our website. VGA or higher-resolution monitor; Super VGA recommended Monitor resolution of 600 x 800 or greater Microsoft mouse or compatible pointing device 128 MB of RAM  30 MB available hard disk space