Is there a way to roll back a vista update without booting into vista? System won’t boot in any modes?

I installed a vista update and on system restart it won’t boot. I have done the repair procedure times and I still get an error. I already looked up the error and it has to do with the update. My question is, is there a way to roll back a vista update without booting into vista? It won’t boot in any modes, I can hook it up as a slave to another computer if I need too, but is there any programs or bootable images i can burn onto a disc to roll back the update? Thanks.

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