|Jpeg-files are 800x600pixels.
For use in older operating systems: convert to a bmp-file in any graphics
program (such as paint, thumbs plus, photoshop, etc.). In older operating
systems the bmp-file should be copied to the windows directory.
In start>settings>control panel double click the "display" icon. In the "background" tab browse to the file you want to have as wallpaper. You can also right-click on the current wallpaper and click "properties" to get to the same control window.