Since I spent most of my time using Minetest on Windows: I am going to share my knowledge with you.
Now: if your game complains about something and you have no clue? Well, step up this topic!
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MSVCRT.DLL Can't be found.
Download and Install.
32-Bit: http://www.microsoft.com/download/en/details.aspx?id=5555
64-Bit: http://www.microsoft.com/download/en/details.aspx?id=14632
Works? Tell me.
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Randomly crashes:
Your game decides to end your game and you have to login again?
Set the minetest.conf - which is found in the base Minetest folder.
1) Open it with Notepad.
2) Look for a line that says: video_driver = direct3d9
3) Change it to: video_driver = opengl
4) Run Minetest without problems.
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