Cannot install - .cab file is 0 bytes

So i downloaded something the other night because i watched it right up until 1.2 gig downloaded. I come home (been out for dinner), and get the process going again and it says failed to install, can't extract the .cab file. I go and find it myself, and it says it's 0 bytes. I deleted it and started again, but it just keeps putting it back. I may need to re download it, but have no idea what do delete in order for the PC to think it isnt there. It's a long weekend in Australia, so I cant call Microsoft Support until Tuesday morning. I really want to get this installed!Can someone help? What do I need to do? I would like to not install it again as it will chew through my monthly download allowance, but I will if I have to.Thanks in advanceJohnsan