Restore Chimera Bootloader?

[DLLauch]

Hello,

I installed Mac OS X ML on my HP Probook Notebook with Windows 7 on another partition (dual boot). I first created the partitions, then installed Windows, then Mac OSX with Chimera bootloader, everything was ok.
The other day I did a fresh install of Windows 8 on my Windows partition (I forgot that I had installed Win7 first and ML 2nd) so it destroyed my Chimera bootloader
It now boots directly into Win 8.

Is there any chance of restoring my Chimera bootloader?

P.S. I don't have a Mac system now so maybe (if it's possible) with a method that works with a Windows system?

 

[DLLauch]

I tried to boot ML with the GRUB bootloader. It detects "Mac OS X/Darwin" and "Windows Vista bootmgr". But when I select Mac OS X I get and error:
"error: kernel doesn't contain suitable 32-bit achitecture.
error: no xnu kernel loaded."

Does this mean that I have to reinstall my ML?

 

[DLLauch]

Ok, now I tried iBoot 3.3.0 it starts booting my system but when the logon screen should appear I get a black screen.
A sign for a broken Mac system?