GIF Animators

Right now I'm using Microsoft's GIF Animator that it came with Image Composer. Granted its... pretty basic but that's how I like my software without dealing with the hassle of being super technical about it. But that's my flaw, I get technical with the details I don't like.

I just made a sprite gif but for some reason, as I play the sprite... it leaves behind the previous image. o.O' So it was a mess at the end behind the final sprite. I tried tweaking and experimenting but I don't think I reached anything that has the effect. Unless I start throwing in blanks or change something in whole.

Any ideas anyone? Gif animators recommendations will be appreciated.

Jam it back in, in the dark.