Basically, Quickbooks won't open is an error that generates due to many reasons, one of them is corrupt or missing QBWUSER.INI file. This error stops loading the Quickbooks accounting page. This creates problems in the user's work.
You can use some steps to solve this error:
1. Run Quick fix my program
2. Create a new Windows user
3. Run Quickbooks install diagnostic tool
For more information visit: https://bit.ly/3rKlLbk