Sony Vegas 9 rendering error? URGENT?

ive been working on this video for my friends, and i wanted to only show them the beginning so i inserted a loop region and selected it. then i went to render as and in the options i put "render loop region". when it was about 46% it stopped and went back to 0% and a error box popped up saying "An error occurred while creating the media file ***.wmv. The reason for the error could not be determined"
and this only happens when i try to render in HD. PLEASE HELP
 
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