There are many reasons why minecraft, or any other software, wouldn't work. Please provide more detail.
If you don't have Java virtual machine software, you will need to download and install one to play Minecraft.
it could be your mods if it is go to your mine craft folder and go to aves and copy it to your computer then delete your .minecraft folder and re download minecraft and u will get your worlds back
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Settings for MC.
There is an option on the downloaded version that says "play offline" click that.
Minecraft 1.5 and earlier: Right Click Minecraft 1.6 and newer: Left Shift I am guessing you will be playing a new version, so press shift. If that doesnt work, right click.
im not sure but if it say outdated laucher try to delete minecraft and then download it again if this doesnt work try to rename it to minecraft.exe or search on youtube
it doesnt