DOS Games made for DOS require an emulator to run on Windows. Use DOSBox or a frontend like D-Fend Reloaded and read this guide to play DOS games on your Windows PC.
"I'm not a fan of platformers. I love RPGs, I enjoyed many point & click adventures, I like most strategy games, but I never got excited while playing a platform game. Lost Viking is different. I LOVED the concept of controlling three different vikings in order to solve riddles and reach the end of each level. A remake of Lost Vikings would be a best seller. Well, retro gamers would buy it, right?" - Abandonware DOS