Map Updater 3.3.3 hang - will make device unusable?

 

After the express program said it did not recognise my device C330 I tried the Map updater V3.3.3, for 4 hours it has been "preparing maps".
But if I try to close the Updater, it tells me the device may become "unusable"

Is there a way to stop the program with out making the device unusable?

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PowerPro Jim