problem with dual boot windows 7 and mageia 2

I have 2 sata hard drives.Initially i installed windows 7 on the first disk and mageia 2(linux) in the second one putting the linux bootloader in the root partition so i could add the linux entry through easybcd,everything went fine.Two days ago i installed windows 7 (64 bit) again in the first hard disk in order to update window7 (32 bit) to the 64 bit version.As normal i could not boot into mageia so i did the procedure you describe in the guide as 'linux before vista' but i cannot again boot into mageia 2,i get a scrollin black screen with something like the letter 'g' repeating at the scrolling screen?Any ideas?