"QuickBooks Company File Won't Open" indicates that there might be a problem with user permissions, missing components, or corrupted files. Making sure QuickBooks is up to date, looking for backup files, and utilizing QuickBooks File Doctor to fix the file are all part of troubleshooting. More complicated matters could require expert assistance. Please contact us at 1.855.738.2784 if you would want to talk with a QuickBooks support representative right away.