With this method you can add any custom button to the Explorer Command Bar/Toolbar which I'm sure you have noticed that Vista and Windows 7 have excluded some familiar buttons, including the Delete Button/Icon.

http://www.aeroxp.org/2008/06/custom-explorer-buttons/

If you just want the "Delete Button/Icon" as I did, then download the following zips and extract the 2 files to any folder. Just make sure the 2 files stay together. Run as Admin., DeleteBTN and follow the instructions. Nothing to install. After its complete, save the zip for future use and delete the 2 files. Thanks goes to Disk4mat.

http://www.filefront.com/13713205/DeleteBtn.exe/

http://www.filefront.com/13713207/subinacl.exe/