I am receiving error message
Quickbooks was unable to open the company file because the file is in use. Another person may be in the process of opening the company file.
Please try to open the company file again. If the problem persists, please contact Quicken Technical Support and provide them with the following error codes: (-6000,-816)
Another error message I get is The file could be located in a Read-only network folder. If it is , ask your system administrator to make the file accessible (-6073, -816)
I am the only user of this program and only on the one computer. The file opened with no problems a few days ago. I have rebooted the computer and tried to restore from backups. I have also created a new folder and given it the name of the old folder with only the latest backup file in it, but get the same error messages. I am using Quickbooks Accounting 2011/2012.