Cannot enter license number

Cannot find the right forum to ask this, but need help. When the box appears for me to enter the license code, it will not accept any characters typed in. I have followed all of the suggestions such as change resolution  etc. Nothing works. Deleted and reinstalled, tried setting to use as administrator. Any help would be greatly appreciated. I am using TurboTax Business. Never had this problem in the past with Deluxe version.