Ok, are you running Windows XP or Vista?
If Vista, uninstall it and do a run as administrator or disable UAC.
If XP, uninstall and try a different version 4.6, isn't mich different from 4.7
8830 -> 8330 -> 9550 -> 9650
Just think about how far BlackBerries have come from then till now... And what else is coming.
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