From ProIcons.com you can freely download 256 x 256 PNG icons for Windows Vista and Windows 7. Is a collection of free icon sets of over 2500 high quality.
This icon pack was done in photoshop & axilias. With a simple modification of the default pack, softly I made these icons to give people more choices & much satisfied with their own desktop. I've include PNG & icons file which works in both OS:Mac & Windows.Download