I tried to copy a screen shot in ms word onto my desktop as a plain image, & all my desktop icons now have black backrounds

I was trying to copy a screen shot I took in windows xp, out of the Microsoft word document & onto my desktop.

All of a sudden my desktop icons are surrounded in a black backround & everything is running slower.

how do I get everything back to normal?

On the Desktop, right click then on properties, Desktop… change the setting.