Keep in mind that Dell is SELLING that motherboard that (they say) needs to be replaced. What you have there is corrupt windows registry, but not corrupt enough to display an error message upon startup. The thing to do is:
While booting press f8 key and select last known configuration. Hopefully this will restore older registry that worked. Only setback is that you'll need to reinstall the programs that you installed in the meantime.
If same thing happends, try booting from CD (Installation or restore) and restore or renistall the windows.
Chaky
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