I managed to get to step 4 but when the audio skipped I rebooted and now its remaining undetected again.
EDIT: Did the entire loop again (Deinstall, Reboot, Install, Reboot, Replug, Reboot, Change BIOS settings*, boot)
* XHCI Mode and XHCI Hand-off is now switched to off.
Should I disable my audio controller? But then I can't use my mic anymore...
And then again for a few seconds windows recognizes the device but when I play it doesn't work and when I went tot the ifi panel it disconnected.
Right now re-plugging the device does nothing. (It does draw power though)
I would consider upgrading my windows pc to windows 8 (or re-install windows7) if it the device worked on my macbook, but it doesn't work there either.
EDIT:
I removed all USB Devices following this guide: http://www.sevenforums.com/tutorials/165554-usb-driver-general-fix-problems.html
The difference is that I now get this at the end of driver installation: https://i.imgur.com/CpMA2sr.png