ubun2

I downloaded the latest version from the site  for a first install on the back of windows 7 premium. I followed the directions and it seemed to install fine but when I select to boot to ubuntu it says " ubuntu\winboot\wubildr.mbr missing or corrupt, status 0xc000000e
I uninstalled it and redownloaded it again and burnt a new disc from the new download and installed again with the sam result. I feel there is no way with a seperate download it would have corrupted again has anyone seen this why cant i get it to run.