When you install a software for the file and data recovery, you are risking to overwrite the lost files with the installation. The safest thing to do if you don’t want to backup your system is to have some software for data recovery installed to avoid the risk of overwriting the lost files.
How to recover data
In the case you accidentally delete your file, you can use a recovery software such as TestDisk. This software uses complex algorithms that search for small pieces of information that are left on the hard drive after deletion, in order to know where exactly the file was located physically. If the software finds the right location, there is a high chance you will get the lost files back from the hard drive. Windows NTFS file system saves the file description information after the user deletes a file. That makes it easier for recovery software to find the files using that information. Systems like FAT and UTF, delete much more information about the file when deleting and because of that recovery software have a more difficult job to find the location of those files on the disc.