Causes of QuickBooks won't open error: 1:QuickBooks® Company file that is corrupt or destroyed. 2:Using the incorrect ways to open specific file formats. 3:Another user on the shared network has already opened the file. 4:Large files, reports, and many windows that are scheduled to open automatically may cause your computer to freeze QB. 5:Attempting to open files with an invalid QuickBooks® version.
Users must choose regional settings that are appropriate for them. QB must be updated on a regular basis by the user. Regularly update the OS. The Windows operating system's regional settings should be adjusted to United States of America.