Updating problem: when you update the older version of Quickbooks to a newer version, you would encounter a problem of “data files”. Unable to read data files while updating is the problem that you would encounter. It is a common problem because of some software defect. It is always better to back up your data. You get a message of “failed verification.”
Connection Problem: Connectivity with data files is the critical problem to troubleshoot. A small interference in the Network might cause a loss of data files.
Failure of Reinstallation: if you want to reinstall Quickbooks then you would have to clean all files associated with Quickbooks then you would be eligible to reinstall it.
Loss of admin Password: This is a usual activity if you are a new admin. It is not a grave problem, you could easily recover the password with help of Quickbooks online support number.