On the folder you want to apply the premissions to;
Right click and click properties.
Click the Security tab
Click the advanced button.
Select the user or group that you want to change permissions for.
Under the “Allow” options, uncheck the Delete Subfolder and Files.
“Warning” – do not check the box under “Deny”
Deny permissions overide Allow permssions, so checking the Deny check box would remove all users, and groups right to delete files and folders for that folder (including Administrator/s).