Now we need a windows logo i got mine from google images. Copy & paste your windows logo onto your canvas and position in the middle of your orb. (If your logo has a white background then just delete it with your prefered tool).

add a drop shadow

add a outer glow

you should be left with this

Select your "elliptical marquee tool" again and draw out a circle at the top of your orb, color it white. Also set the opacity to 25%, Then mask the layer. You should end up with something like this.