Quicken usually alerts you that you haven't made a recent backup and the auto-backup feature may store backups you don't know about.Select the "File" menu, choose "Backup and Restore" and then click "Restore From Backup File..." from the list of options.However, using System Restore won't help you recover your data.
Before manually entering all of your lost transactions into the register, check to see if you have an automatic backup running on your machine.
I will attempt to try 2017 version on the other computer and see if the problem replicates on that computer.
I should never have attempted to upgrade to 2017PP and recommend others not to upgrade. I also validated and super validated (with no change) (ie. )What I found that worked for me was to delete all files except for the QDF file.
Select the "File" menu, click "Backup and Restore" and choose "Backup Quicken File..." to create a backup of your current data.
Sometimes, you haven't actually lost any data at all.Before attempting any repairs or a system restoration, you should create a manual back up to ensure against further loss so that you can revert any changes made during a validate or system restore process.