When you are encountering the issue of TurboTax not opening, then it might be quite frustrating and especially when you are in the middle of filing the tax. However, if you know about the root cause of the issue, you can troubleshoot it quickly. Here are some of the reasons why TurboTax not opening issue occurs. These reasons are corrupt Windows files, TurboTax subscription is expired, manufacturing defect of the system damaged Windows registry key permissions, or malware or virus attacks.