The "QuickBooks won't open
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" error means that your company file is already open or you are trying to open a database that was last used with another version of QuickBooks. It could also mean that the company file or an attachment you try to open (such as a journal) is corrupt. There are a variety of reasons why the QuickBooks will not open. If you're running out of disk space, delete unneeded files on your computer. Check for any viruses that may have infected your computer and remove them. You may also want to install all pending updates. If none of these work, it's best to contact their tech support team for more specific help.