My suggestion is that you start with fresh installation.Follow simple steps :
1. Download wp-config.php file
2. Now for safety backup the database and don’t delete it.
3. Download the Wp-content folder
4. Download WordPress from – https://www.ads-software.com/download/
5. Upload it and unzip the folder
6. Delete “Wp-content” and “Wp-config.php” and replace the old file that you downloaded
Note: It will work fine.You don’t need to link database as it is already linked.