Minecraft – I can’t sign into the windows minecraft launcher

There is a number of things you should rule out first:

• Are you able to login through http://account.mojang.com/login?

• Are you using the proper client from http://minecraft.net/download?

• If you were able to login with your old computer; make sure your current one doesn't have any firewall blocking internal / external connections.

• On the computer with the issue, do the following:

  : Go to this url, and substitute USER for your actual username and substitute PASS for your actual password.

  : It should output a Session ID (a bunch of numbers and letters), if not; and it returns Bad login or another exception; contact mojang.

Mojang accounts are not Minecraft accounts. You can get a Mojang account for free (it requires no username), but you must actually buy Minecraft to play it. When you buy Minecraft, you will be asked for a username.