OK for starters technology is not my "strong suit"

I bought a "beginners" camcorder recently (Canon MD 120 model) which uses a mini DV casette.
Using Windows Movie Maker I've managed to edit simply but sucessfully and back up onto CD.
I've tried to send using the "send by email" facility but the picture quality received appears to be awful in comparison to the original.

I'm a great believer in "If at first you don't succeed" you're probably - well in my case almost certainly - doing something wrong.

Any suggestions, preferably in words of one syllable and "jargon" free, gratefully received