Well...I have windows 98 on my PC, too! And I think too that Rockstar Games has specially adapted GTA: SA to 2000 and XP and not to 98. But even then it can be played on 98. I don't think they've made an extra "blockage" for 98 because this would be silly and costly! So...when it can't be played on 98 it's because of some special effects in the game or things like that....