I just loaded my new computer ( Windows 8) and i downloaded the minecraft launcher, then java, then i started it up and it started up well, the launcher exited but then it came up with the error

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What I expected to happen was...:
Minecraft would start

What actually happened was...:
Describe what happened here

Steps to Reproduce:
1. Put a step by step guide on how to trigger the bug here
2. ...
3. ...