problem resizing avatars and animating them

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MSP & MS3
So I found a kick ass avatar like animation... problem is, it's too big!! message tells me it has to be 100x100 pixels... this one's like 138x84... tried to "resize" it using microsoft picture it software... but that didn't do anything. the only thing that worked was cropping it... but then I lost a bunch of the picture. even still, it didn't animate once I selected it as my avatar.

I know this isn't a big deal... but it would be cool to learn how to do this. Anyone have any feedback??? I'm not a complete dumbass when it comes to computers.. but I'm definitely no computer science major!
 
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