im really sorry but you cant download it on the internet from what i can see but you can click f8 while boot and try and find a option called "run startup reapair" Lets just hope that works otherwise you can buy a recovery disc on ebay or some online shop. but try the f8 while boot before you go and buy a recovery disc. also what version do you have? Professional or Home and student. you can check by going to My computer and looking for properties on the left i think. I hope you can get it to work.