Apparently ERUNT still works on Windows 2008.
http://www.larshederer.homepage.t-online.de/erunt/
http://community.spiceworks.com/how_to/show/19972-installing-erunt-automatic-registry-backup
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Use the emergency repair disk ('rdisk /s') then copy the compressed registry backup that is created:
%SystemRoot%\Repair folder
http://support.microsoft.com/default.aspx?scid=kb;EN-US;323170
tags: windows, registry, erunt