Inspiron 17-3737 failure

Been using the laptop for less than two years, always had minor issues, but would never be able to complete backup/restore after the first two discs.  I don't remember the text or reason.  Warranty was expired because I purchased as extra laptop and didn't need it until 9 months in.  So I let it go.  Several days of startup problems and the hard drive is done.  2000-0142. Lost all photos and patterns.   Will get a new hard drive, but have no disc for 7 and don't see anywhere on Dell's site for disc.  I entered the Windows7 code at MS website and screen said to go to mfg website. Tried to request online but no help because out of warranty.  Download is available - is that possible with new HD and no OS?  Will the laptop be recognized with the new drive for the free 10 download (if I ever get 7 in)?  My HP Windows 7 is 64 bit and I don't think the Dell is.  Any suggestions?  Forgive me - but I'm not computer savvy in the least.  Thank you smart people.