Oh that's strange. I personally don't have a windows mobile phone, but a quick google search brought me to this:
http://www.wp7forum.com/windows-mobi...gistry-editor/

Maybe your phone re-locked itself? (I have no clue what it means, though - but maybe you have a clue ? )

Anyways, I'm about to make a windows built - it will be xap - but maybe it works then?

Thanks for giving it a try, though !