so i inserted my windows7 ultimate 32 bit cd in my dvd drive, entered the setup selected custom install. so in my 500gb hard disk there are 5 partitions, 1 for system and 4 for data. all are primary. i formatted the first partition which contains my windows 8. then when i try to use that partition for my windows 7 this error appears “Setup was unable to create a new system partition or locate an existing system partition. See the Setup log files for more information.” i tried manually formatting the partition using diskpart. restarted and it says that the partition is now a system yet i still i get the same error. need any thoughts on this, im thinking of clean formatting the whole hard drive but i have files on the other 4 partitions, and i cant back them up since i lost my windows 8 os when i formatted it.