Slimming the system disk is usually a function provided by the tool software, which can be deleted or restored. Please open the optimization operation record of the tool software to see if there is any recovery option.

The wallpaper that comes with win7 system is generally stored in? C: In the path of \ Windows \ Web \ wallpaper, you can make a copy on another computer.

If the system has started the restore function, you can consider using system restore. ?

Look for the deleted files in the recycle bin first, and recover them when you find them. If you can't find it, you can download a tool software (such as EasyRecovery) to recover the mistakenly deleted files.