Minecraft not working

Does the launcher output log show anything?

There are a number of different reasons that minecraft can't launch. Nobody can help you unless you provide the log text. Just attempt to launch minecraft, wait a while (maybe until the progress bar stops moving), go to the "Development Console" tab, copy all of the text into a pastebin, and provide a link.

Just so you know, I figured out what was going on: there were too many installed things on the computer.