I got a problem with bootcamp
I would say start in recovery-mode (hold cmd + R on booting). My english is not the best but I'll try to explain:

You need a internet-connection and a (Time-Machine-)Backup of your whole data.

In the recovery-mode you have different utilities. You need the "Disk Utility". From there you delete your whole data.

Then you install from another utility (don't know the name) a new copy of the actual Mac OS X. Just migrate it with your backup and here you go. 

The procedure with Windows you have to do again via Bootcamp, I don't know what you did this time and why it stucks.