NT users can get around the installer by manually installing the game themselves. Note however that you must have at least NT 4.0 with Service Pack 3 in order to play the game. Insert your actual drive letters where appropriate. Do not copy anything else. This is the same as the smallest install, but is also the slowest way to play the game.
All features are present under all install sizes.
The game runs slowly or crashes often. You can install a larger amount of the game to your hard drive. If you are using Win95, try the DOS version instead. Try installing DirectX 5.0 and the most recent compatible drivers for your video card. Grab the patch from the Files page.