hm it still doesnt work. I set the permission and changed folders :/

OK, next test is to re-mount the boot.wim image #2 and using explorer, navigate to C:\Mount\Windows (inside the mounted WIM), and try to drill down to System32. I'm hoping it throws an error saying you do not have permissions to read inside the directory. (based on the second clause in the listed error)

Otherwise, is there any way you can replace that boot.wim with one from an untouched DVD source just to rule out anything henke going on with it. Try it with a different boot.wim, its possible yours got corrupted somehow.

Yet another issue may be that you are not running it from an "Administrative" context. Did you open CMD with Run-As Administrator

Woho! It worked! it succesfully added my drives.

So what do I do now? Do I just burn the whole windows folder with the modify boot.wim?

sorry for being a total noob

Edited February 11, 201016 yr by zynthetikk

Do I just burn the whole windows folder with the modify boot.wim?

You just need to modify/recreate your DVD with the new boot.wim and it should work (test ISO in VM before burning).

okej I´ve done everything correct now and it still doesnt find my SATA drive on the pre-install (sigh)

Anyway thanks for the help, I will probably have to send it back to the shop now.