The Jigetiser jigsaw puzzles need
Windows 95/98/NT4/Me/2000/XP/Vista
8 MB RAM
20 MB free hard drive space per puzzle package, plus 5 MB for the puzzle browser
MS Internet Explorer 3.0 or later (only necessary to show the top banner)
If you use Linux or other x86 compatible Unix systems you can install Wine and it will work, too.