Here’s How after installation:
bcdboot c:windows /s c:
You should get a message similar to:
Boot files successfully created.
2) Open the Disk Management GUI (you could use diskpart for scripts), locate the C: partition right-click and select “Mark Partition as Active”, select yes to the “do you want to continue message”
3) Reboot to confirm that everything is ok.
4) In Disk Management you can now delete the 100Mb System Reserved partition by right clicking on it and selecting “Delete volume”
Heres how during Setup:
Open a command prompt in the Windows setup using Shift+F10 at the disk manager screen
Type the Following:
DISKPART> select disk 0
DISKPART> create partition primary
DISKPART> list volume
You should now see your new Primary partition
Switch back to the setup screen, refresh the disk partitions and click install