Your insight into the old data causing the problem is helpful. Here’s are some ways to address this issue (updated with your insight) and links to sources::
Steps to Resolve TurboTax Not Responding
- Clear Cache & Cookies: This is a common first step to resolve many software issues
- Uninstall & Reinstall: Sometimes a fresh installation can fix problems for TurboTax Desktop.
- Check for Old Data: As you discovered, old and no longer relevant data, such as depreciation forms from many years ago, can cause TurboTax to jam up. Deleting these forms can help the program run smoothly. See here for steps to delete forms.
- Backup Important Data: Before deleting any old forms, make sure to back up any important data.
Troubleshooting links:
