If you can't get your return to open, you can't remove the state from your return. You have to first install the state program to open a .tax file.
Or do you want to delete a state return?
How to delete a state in the Online version
https://ttlc.intuit.com/community/using-turbotax/help/how-do-i-delete-my-state-return-in-turbotax-on...
How to Clear a state in the Desktop program
https://ttlc.intuit.com/community/state-taxes/help/how-do-i-clear-my-state-return-in-the-turbotax-fo...
