ISSUES opening Solidworks files

I have created hundred of files over the last 6 months. These parts were saved locally to my computer. Now anytime I attempt to reopen these same files from only a few weeks ago I get Import Diagnostic panel as if they had never been opened or designed on this PC before. Feature Recognition is not recreating these complex models well enough to trust with all of these files. I have searched around for better information but have not discovered what I need to remedy this situation.

Is there a quick fix???