On Windows 7 computer, if you delete a file from hard drive partition, it is still possible to recover the file from Recycle Bin. But I have deleted the files permanently from my Windows 7 laptop with shift delete, so the files are not moved to trash bin.
Luckily I had a friend who helped me. Basically there are Windows data recovery free which can recover deleted files from Windows computer recycle bin. So I follow this tutorial: Windows recycle bin data recovery
The Windows data recovery software is easy to use and can recover deleted files from Windows computers, including Windows 7, Windows 8, Windows 10, Windows Vista, Windows 8.1. You can recover lost files even after Windows computer recycle bin empty, or files are deleted from recycle bin. You can use the Windows data recovery software to restore photos, videos, music files, document data, and other files and folders from Windows computer.
Here's some other useful data recovery solution
Recover photos/video/documents windows 7 recycle bin
How to restore permanently deleted files
Windows computer data recovery