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Thank you for posting here in Community @perzel.
There are a few reasons why your QuickBooks won't open:
To fix it, you need to download QuickBooks Tool Hub and run a Quick Fix Utility. Here's how:
When your QuickBooks Tool Hub is already open, you can run the Quick Fix to repair the program.
You can also use the QuickBooks Install Diagnostic Toolto resolve possible installation file damage. Here's how:
I'm also attaching these articles if you're still unable to open QuickBooks after the troubleshooting:
Don't hesitate to comment below if you have additional questions. I'd be glad to help you right away. Have a good day!