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There are some file retrieval programs or apps which are used by the professionals to dig out the old files from the hard disk. Hopefully all your file would be there. This is a painstaking job to retrieve the old files from the hard disk and it has to be done one by one checking those files which will not have their original names and will have a new name something like file00001 etc.
I will not recommend to do it oneself as some expert is to be consulted as there are many apps for that but which one will really work in your case is to be seen by some expert technical guy.
Some of these apps are - Stellar Data Recovery, EaseUS Data Recovery Wizard, Disk Drill, Advanced Disk Recovery, MiniTool Power Data Recovery etc.
Knowledge is power.