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Rather depends upon whether there is a Nokia Care facility relatively accessible http://nokia.com/support as you could always start with C7-00 switched off and carry out thre key depressed power on "hard reset" but bear in mind that all user data upon C:\ and E:\ would be deleted including pre-installed wallpapers & media and removal of a couple of certificates could necessitate software being completely re-furbished if Nokia Store & Maps not functioning correctly.
If I've helped in any way, a click upon the white kudos star would always be appreciated.