oli

I recently installed dune 2000 onto an old laptop running windows 98 second edition. I've completed level 1 but then when i click continue it starts back at the level 1 map. I've tried changing factions and difficulty levels. I can save/load games. I've checked the web and can see that others have had the same problem but I can't see any solutions. I've uninstalled and reinstalled with the same result. The laptop is a P3, 64Mb RAM, s3 savage 8mb graphics card. Any help would be great.