my pc want install windows 7 after someone acidently deleted a file im trying to use the windows 7 installation disk because my pc was messed up while trying to boot from cd disk drive it loads the files but want expand and says files corrupt or missing code error 0x80070017 try it the same way but at the install portion area it formated it in the right place and then it says the device driver need to access your hard drive is not found so what to do to get the driver so it will access my hard drive so windows will install??