Find the osimage on your restore partion and point at it with reagentc command.
The osimage might be install.wim. More likely to be Install.esd.
It will be big about 3gb.
If you can't see it in windows explorer, you can see it using Partition Guru.
When you know where it is, you point at it like this:
1) Rt clik on Windows\System32 and open a commnad prompt.
Type resgentc /info, then press enter.
Hiopefully you will see that reimage is successfully listed.
Point it at the directory ( folder ) containing your osimage like this:
Reagentc /setosimage /path driveletter:\folder-containing-osimage /index 1 /target driveletter:\Windows