Have you tried to start the program by right-clicking the program icon and selecting 'Run as administrator'?
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Have you tried to start the program by right-clicking the program icon and selecting 'Run as administrator'?
on a side note then, it is interesting that you needed to deactivate and reactivate when installing the same program version on the same unmodified computer, that should not be necessary..
I can remember in the pre-P3 licence days a simple roll back to an OS restore point throwing the activation, it is as they say in my part of the world, a caution