someone know how can i get back my saves? :(
If the system was reinstalled without creating backup copies of the data, then no way. Because the saves are in the game folder and in a hidden system folder. If there is no copy of the previous version of the game (with the saves folder inside) or a backup copy of the appdata folder was not created, then the saves are completely deleted.
In this case...
1. Download the current version of the game, for example, from this page.
2. Launch it and start a new game.
3. Make a save. Then turn off the game.
4. Go to its game folder, a folder for saves will appear in it. Place your saves there.
5. Launch the game and look for your saves on the loading screen for saved games. The first digit in the save usually indicates the page number.
If you do not see your saves in the game, then they are either from another game, or damaged, or you forgot to extract them from the archive (the game does not understand the zip, rar, 7z formats)