Adobe?

HI i got a biiiiiiiiiiiiig problem with my adobe premiere 6.5 editing program and i captured a vid to wmm and i saved it and made a movie of it . the total is 75 mb . ( unedited!) when i transfered it to adobe and made a movie cutting it more than half its like 2 mins long out of the 76 mb its like supposed to be atleas 15 mb or something how do i save it and do the right thing!
 
export uncompressed then open it up in movie maker and hit save to my computer and do fit file size and pick a file size, any file size that's what i always do cuz it works.
 
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