1) Close TurboTax
2) Go to Task Manager, click on the "Services" tab. Try finding "IntuitUpdateServiceV4".
3) Right click on the service and click on "Stop" to stop the updater service.
4) Once the updater service is stopped, Go to "C:\ProgramData\Intuit" path and delete the "Common" folder.
5) After deletion, restart the Updater service i.e. Go to Task Manager, click on the "Services" tab. Try finding "IntuitUpdateServiceV4" ,right click on the service and then click on "Start" option.
6) Once the Updater service is started, try opening TurboTax again.
