Minimum Machine Requirements

486 CPU
Sound board (optional for trip and tour narrations and music)
Video display with at least 64k color depth at 640 x 480 resolution
16 mb RAM 
20 mb available hard disk storage
Windows 3.1 or later.  ME and XP are fine.

If you have a MAC, the program Virtual PC can run Windows 95 and the Sierra Nevada CDs. For details, contact Mountain Images.