Wyse Z90DE7 - problem with settings

Wyse Z90DE7 - problem with settings

Hi

This is my first post so please be patient

I've a Wyse Z90DE7 Thin Client to test and I noticed that configuration is very strange. I connected device to Active Directory, logged on device with AD credential and everything looked fine. When I restart a device all settings gone. I had to add to AD again. Where can I disable this settings ?? Maybe this is special version Windows 7 Embedded Standard, I don't know. I would be grateful for any help.