My guess that there is some other hot keys attached to '+' & '-' keys on your keyboard.
Try to put your system in clean boot and try to launch Lightroom and see if the issue still occurs.
If you dont get the issue any more go ahead and isolate the app which is causing issue by following divide and rule method on the apps.
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I think i got it figured out. I have a Logitech G13 using for macros in lightroom and i think that is the problem.
Thanks for your help