Help fix my multiboot win xp/7/8.1 missing NTLDR

keys

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I had a working multiboot setup on my Acer Aspire One ZG5, running win xp, 7, 8.1, linux. I decided to add an extra partition, and in doing the resizing lost my Grub boot loader so can no longer boot into linux, but that's not important atm. I have also messed up my windows boot loader and at the moment I can only boot into win 8.1.

Win 8.1, 7 and legacy OS (xp) show in the boot menu but when I choose to boot into either xp or 7, I am presented with the message
windows failed to start
file: /ntldr
status 0xc0000225

Previously I had the message filesystem unknown , missing NTLDR, but I ran the recovery console and that message no longer appears

How can I fix this?
 

My Computer

System One

  • OS
    Multi
Did you make a full System Image using a 3rd party backup software that support all the OS's?
 

My Computer

System One

  • OS
    ME, XP,Vista,Win7,Win8,Win8.1
    Computer type
    PC/Desktop
    Other Info
    Notebooks x 3

    Desktops x 5

    Towers x 4
Okay, did steps 1-3, it found 2 windows installations. I can now boot into win 7 and 8.1. How can I get win XP to boot?
 

My Computer

System One

  • OS
    Multi
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