Why wont Minecraft open on Windows 10?

I just bought Minecraft for PC and it wont open on Windows 10. The computer I have is a Dell Optiplex 755 with a Digital Western 1TB HDD and 2x2GB RAMs that should be able to support Minecraft. It says to update my graphic drivers but they wont update. How do I fix this? Ps The Windows 10 Demo does work.

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