or if you only have simple tools like paint: create in paint, pick a background color not in you icon (i use the magic pink - Red 255 Green 0 Blue 255 - paint will save as a .png. Open that png in Irfanview (it's free link]http://irfanview.com/">Link), save as png again in Irfanview (new name) a box will pop up, check save transparent color, you will get a chance to click the color to be transparent, click the pink and it goes transparent.