How to prevent remove folders

[guest]

>Our F: Drive setup is as follows
>
>\Sales
>\Sales\Leads
>\Sales\Documents
>\Engineering
>\Engineering\Drawings
>\Engineering\ECO
>and so on.....
>
>I am having a problem where the person working on the \Engineering\Drawings
>folder keeps mistakenly dragging and dropping the folder to one of the other
>branches in the tree because he is moving his mouse to quickly. Shooting
>him up with valium did not seem to help prevent him from doing this so it is
>impossible to train him not to mess up any more so I need a permissions
>solution.
>
>He requires the ability to Add, Delete, and Modify files and subfolders
>within the folder but a few of the settings I have tried just don't seem to
>be working out. I tried to give him permissions as follows:
>
>This Folder Only: All permissions but "Full","Take
>Ownership","Delete","Change Permissions"
>SubFolder and Files Only: Modify
>
>That did not work so I tried to put "Deny" for Delete for "This Folder Only"
>for a permission in addition to his Modify permission, but that prevents him
>from deleting any files within the folder.
>
>
>
Grant him Modify \Engineering\Drawings
and then on the Advanced tab, deny him delete for "This folder Only"