Need computer help

[Topgunben]

Looks like my HDD has died, windows won't fully load, can't get to login screen. I'm certain it's the HDD, as I've had warnings of its pending demise.

Anyway, the good thing is, every thing important is backed up on SSD's. The bad news is, I can't find my windows 7 CD, it probably got thrown away. So I don't have the CD key or disk, and I need those to do a fresh install on to my new SSD.

I'm considering downloading a pirated copy of windows 7 on a separate computer and writing it to a disk or jump drive if that will work? Id prefer to do this another a more legitimate way, but I can't figure it out.