QuickBooks event id 4 occurs when there is some issue with .NET Framework 4.0 in Windows 7. QuickBooks is a very reliable and highly efficient accounting solution and is full of handy features that allow its users to do various types of accounting tasks quickly and easily. But as you know that no software is free from bugs and errors, so same is the case with QuickBooks. From time to time, you may face different types of errors with QuickBooks, one of which is QuickBooks event 4.