Delete the folders "blocks" "chainstates" and "backups" then start the wallet with -reindex. That should do it.
Matrix
Whats -reindex
This comment concerns me as you have 500+ posts and are advertising for something crypto in your avatar
In windows after shift right click choose "open cmd window here" > type "kore-qt -reindex. This will rebuild blockchain index from current blk000.dat files on startup.