I was running Windows 98, which is nice and outdated for almost everything. It ran fine, but as soon as I upgraded to Windows XP Pro, there was a 50% speed increase. However, for all Windows releases before XP, you need to download and install the free Microsoft Accessibility Kit. This is found either on the CD 3DGS came on (not your key disk), or on the download page.

"You level up the fastest and easiest if you do things at your own level and no higher or lower" - useful tip My 2D game - release on Jun 13th; My tutorials