How to recover files from My Documents folder after reinstalling Windows
After reinstalling Windows,the system folders will overwritten about a few GB C drive space.
So other files still on the C drive.
But new Windows can not see them.
So you need use best data recovery software to scan .

Use “Undelete” to recover deleted files from My Documents folder after reinstalling Windows 7/8/8.1

Use “Unformat” to recover files from My Documents folder after reinstalling windows formatted C drive

Use “Recover partition” to recover iles from My Documents folder after reinstalling windows if partitions changed or damaged or deleted.

Use “Full Scan” mode to recover iles from My Documents folder after reinstalling windows which can not be found with “undelete” and “unformat” and “recover partition”,show as raw partition,partitons which are not NTFS,nor exfat,nor fat32. With deep and full scan