Shoutbox

Icon packager is a program used to download and install different icon themes and can be found here http://www.stardock.com/products/iconpackager/

You can use this program to resotre all default icons, but this will change any file types you have customized yourself, so it may not be the best option.

However icon packager is actually a very good program. I use it as well. Different icon themes to be used with icon packager can be foun here http://www.wincustomize.com/Skins.aspx?LibID=2 for anyone who wants to use it.