Since you are using TurboTax Deluxe (Windows), try switching to the Forms view (Ctrl+2) and then use the Open Form feature to access Schedule A (type "schedule a" into the search box). Double-click on "Schedule A: Itemized Deductions" to open the form. From there, click on the magnifying glass next to line 1. This will open the Medical Expenses Worksheet where that insurance amount should be listed. Locate the amount and delete it.
Please comment if you need more help with this. You obviously need this situation resolved as soon as possible.