Even without any reply i want to inform this community about my further tests on this problem: Once again i want do describe the problem: ----------------------------------------------------------------- When installing W7 unattended in audit mode the Owner of Drive C is Trusted Installer an the File Permissions are the following: Authenticated Users: special System: full Admins: full Users: read, list folders, execute After generalizing the computer and activating oobe the computer restarts and drive C is not accessible anymore The Owner of the drive C is unknown and the SID of this owner correspondends to the Administrator account in Audit mode File Permissions are the following: System: full unknown account(with SID corresponding to the Administrator account in audit mode): full Admins: full Then i tried to take ownership of drive c and gave the actual user full file permissions. Then drive C was accessible again. Some files on this drive seem to not have set the right permissions so they are still inaccessible. This results in some functions not working properly(Windows Update, EventViewer(security)...). I can set the file permissons manually an so the eventviewer for example works without problems, but i never can be sure that there are not other files with wrong permissions and therefore some functions not working properly. So this computer cannot be rolled out to my customer. ------------------------------------------------------------------------------------------------------------- Further tests showed: First of all there is no difference in this problem between WAIK and the Win7 OPK I tried a simple autounattend.xml file according to the WAIK documentation and all went without problems. So i tested the differences of my autounattend.xml file and the "WAIK" file step by step and found the problem arising when installing a dataimage in WindowsPE Pass. The idea behind this dataimage is to inject my oemlogo.bmp since the usage of $OEM$ folders isnt recommended anymore. The dataimage consists of a folder called windows with a folder called medv in it and the oemlogo.bmp file in the folder medv. This dataimage is installed to disk 0 partition 1 in the WindowsPE pass. So when trying to apply a dataimage the owner and file permissons of drive C are messed up after sysprep with /oobe /generalize Without the dataimage all works normally. @Brandon: There is no problem with WU. WU was not working due to wrong file permissions on drive C I tried W7 OPK with showed the same behaviour Does anyone know How to install a data image in Windows PE without messing up system drive permissons? tomha