@Uncle-Frank @Wayne-Workman 4848 solved my extended partition problem. Thanks a lot!

I created a new installation of Windows without system reserved partition. Apply the following steps when the Windows partitioning window apeares: Create a partition on the blank hard drive. Select the partition drive as the partition to install Windows on. Click “Next”. The 100MB partition will be created. Delete the partition which you created in step 1. Extend the 100MB partition to the desired size. Select the partition which you extended in step 5 and select ‘Format’. After formatting the ‘system reserved partition’ will now become normal ‘system’ partition. I can confirm this works :-)