Har löst det.
Skrev på ett annat engelskt forum hur jag gjorde, orkar inte översätta. Men jag vet att många fler har problemet, så då kan dom ju följa detta:
This is how you resolve it.
USE A USB 2 DRIVE!
And then follow these stepps:
1) Fix a Windows 8 or Windows 7 .iso, this procedure fixes the mouse issues both have.
2) start bootcamp and when it asks you what you want to do, check the first two options (create windows 7/8 install disk and download support media)
let it work...once it is done then quit bootcamp COMPLETELY.
3) start bootcamp again and this time select install support media to the same usb drive
let it work and then quit bootcamp COMPLETELY.
4) start bootcamp and this time select install windows 7/8. bootcamp will automatically restart your computer into windows setup. From there continue on like normal.
you have to let bootcamp restart your computer (you can't close bootcamp and then restart from the menu yourself...you must let bootcamp do the restart)
your usb drive shouldn't come out of your computer during any of these steps.
