I'm not sure what you mean by "your c drive has no partitions" since C is a partition. Are you saying your primary master has no partitions? fdisk /mbr erases the master boot record, which you should only do if you're wiping the drive. If you run fdisk, what does your drive look like? Does it come back as "no partitions defined?" If you try to boot into Windows, what error(s) do you get?