If the persistent registry is corryupted, running DelRegBackup.exe (found in the \Windows folder of the device) will delete it. Once deleted you will have to restart the device to restore the registry to factory settings.
We can give you a copy of the one that shipped with your system, or you can download one from the build selector.
If you can email us the configuration number for your board, we can send you the configuration file that was originally installed. The configuration number is of the format 900xxx-xxxxx.