http://windows.microsoft.com/en-US/windows-vista/Change-the-colors-and-fonts-used-for-webpages (http://windows.microsoft.com/en-US/windows-vista/Change-the-colors-and-fonts-used-for-webpages)
(http://img715.imageshack.us/img715/1695/selection007d.png) (http://img715.imageshack.us/i/selection007d.png/)
Unfortunately Internet Explorer does not set up properly on some machines and versions, and only a partial override is achieved;
(http://img443.imageshack.us/img443/6236/selection008.png) (http://img443.imageshack.us/i/selection008.png/)
To overcome this;
http://bootstrike.com/Articles/IEColour/ (http://bootstrike.com/Articles/IEColour/)
this allows you to get a complete dark background;
(http://img542.imageshack.us/img542/7287/selection009g.png) (http://img542.imageshack.us/i/selection009g.png/)