Hello Yagermeister! Well, if you use the basic Autounattend.xml you should be asked for the disk configuration. Do you get the disk configuration dialog before getting this error? And how long does it take, till you get the error? Regards, Martin With some fiddling i found out where the error is but and how to solve it using a copy of some other parts from a other auto file but then its not complete unattended anymore. I get the error while being at the disk configuration btw. I found out that the following code gives the trouble: <OSImage> <InstallFrom> <MetaData wcm:action="add"> <Key>/IMAGE/NAME</Key> <Value>Windows Vista ULTIMATE</Value> </MetaData> <Path>install.wim</Path> </InstallFrom> <InstallToAvailablePartition>false</InstallToAvailablePartition> <WillShowUI>OnError</WillShowUI> </OSImage> When i replaced it with the following it did work but i got a question which version Vista i wanted to install: <OSImage> <InstallFrom> <MetaData wcm:action="add"> <Value>Windows Vista ULTIMATE</Value> <Key>1</Key> </MetaData> </InstallFrom> <WillShowUI>OnError</WillShowUI> <InstallToAvailablePartition>false</InstallToAvailablePartition> </OSImage> Do you perhaps have a idea how i can get around the box asking which to install?