As mentioned I have set the permissions to full control and yes IIS is in Scripts and Execute mode. I can't find anything special in the logs ether :/. IUSR_* is not the case here since as I said I amde a special user and user group and logged in using Authentication Method. When set to Adminsitrator group it works, but when set to any other group even one with full control over ALL files in C:, it won't work. So somewhere out there is some kind of permission thats the cause. I'm thinking of looking into PermVerif tool in the resource kit, but if anyone knows the solution to this it would be greatly appredciated. When looking on the web I found this problem in many palces but left unsolved...