I have a dell studio 1558 and my hardrive was damaged so I replaced it with a clean one. So I am trying to download the operating system from the Start up CD but all it is letting me do is the diagnostic check.  When I refuse the diagnostic check it reads this on the screen "Your CD/DVD drive during this boot cycle is f: A RAMDISK drive is available for this boot cycle as D: it contains several Hard Drive setup tools. Please only use this tools under the direction of the dell support staff. " then F:/> if someone could help that would be great.