I'm afraid that by reinstalling the operating system you seem to have overwritten your data. Your chances of recovery are now almost zero. Was there a particular reason that you needed to reinstall?
You might like to check Disk Management to see if there is a partition that doesn't have a drive letter associated with it. If so, give it a letter and see if it contains your missing data.
It sounds as if you didn't keep any backup copies of your data. Although too late now, it would be a very good idea to do so in future; hard disks have been known to fail.