There are plenty applications that you can use to recover or repair the PST files. These tools are modern and developed to suit the needs of users who encounter more and more issues with Outlook.
To download an application of this type, I recommend checking the database of Software Informer. Tick the Free Only next to the search field if you want only the freeware applications.
Once you have the software installed, use its built-in features to scan, recover and repair the PST file.