Something is wrong with my Minecraft?

So my family just got our computer upgraded to a Windows 7 because our last computer was really old, so i tried downloading Minecraft on it (minecraft.msi) and i did everything you're supposed to do, going on the website and downloading it, running it, but after it finished downloading, it displayed a message on my screen, "Unable to start the Minecraft Runtime Environment. This is most likely caused by a corruption. Please try to reinstall Minecraft." I keep trying to redownload it but it keeps doing the same thing. What do i do?

Restart your computer. Make sure you delete all known files that have to do with your Minecraft. Then go to the website. The same thing happened to me but I did this and fixed it.