Graphical Problem Dual Boot Kali / Win8 (pic inside)

Hello,

i have the following problem:
- i installed windows 8
- then i installed kali
- when i boot to windows, the screen looks like this:

http://imageshack.com/a/img703/8584/ezcr.jpg

besides from looking like this, windows seems to behave normally, meaning i can login etc.

then i booted from the windows-dvd and tried to repair the installation. but automatic repair doenst work, and with another repair option, i get told that the windows drive is locked.


any help appreciated.