There are some QuickBooks data situations that have good endings, and some that don’t.


  • -6000 errors. If you get a 6000 error when you try to open your company file, most of the time if means that your data is corrupted, but most of the time, it is also repairable.
  • “Connection to database lost” errors. Ditto above.
  • Errors triggered when accessing particular accounts or transactions. Same.
  • Failures during upgrades, backups, verifies, rebuilds. We can fix these.
  • For pre-2006 QuickBooks versions, c-342, c-43, c-44 errors are almost always repairable.


  • -6150 errors. This error usually indicates hopeless file corruption. A critical area of the file has become damaged that is not reconstructable. Although this error indicates that the QBW file is unrecoverable, we can still help you if you have an old but good backup and a current TLG file.
  • Files recovered from damaged or reformatted hard drives. This situation is common, but unfortunately, does not usually have a good outcome for data repair. Files recovered from damaged or reformatted HDs, or undeleted from drives, often have random contents — not the original QuickBooks data that was there in the first place. I don’t know why that is, but I’ve talked to a lot of users and IT people over the years with this situation, and that seems to be the case about 90% of the time that people contact us.

A quick way to test the recoverability of a file recovered from bad media is to zip the recovered file with WinZip or Windows folder compression. In a lot of cases, the file will zip up 99%. For example, a 100MB QBW file will zip down to 1MB. That indicates that the original contents of the file did not get recovered properly, and you ended up with a QBW file full of zeroes.

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