To make a long story short:
I uninstalled ad so that i could install it again, together with the dns server..
After i uninstalled ad the server tells me:
LSASS.EXE - System Error, security accounts manager initialization failed because of the following error: Directory Services cannot start. Error status 0xc00002e1.
Please click OK to shutdown this system and reboot into directory services restore mode, check the event log for more detailed information.
So.. i do as suggested:
I start the server in DSRM, and when the server gets to "applying computer settings.." the server restarts..
I tried to perform a "last known good configuration where the system worked.." but this didn't help me out either.
I tried to boot in boot-safe mode, which didn't help either.
I'm out of ideas on how to solve this. Any one knows the magic trick? :p