Reinstalled Clover + El Cap, Windows 7 wont boot anymore? "Missing operating system"

[Ed Ding]

Hi!

I reinstalled Clover, did a fresh install of ElCap and everything works including the bootloader.

- when I choose "Boot Win 7 from Legacy HD3" a small square comes up and then a black screen - nothing happens.
- when I hit F12 on startupt choosing my startup volume in BIOS and try either my 640GB Win HDD or the UEFI part of that disk it says: Missing operating system.
- when I unplug all HDD except the Windows one it still says: Missing operating system

I already tried to fix MBR with my Windows DVD but it didnt help.


Would be great to boot into my Windows install again without erasing everything

Thanks!