- last post: 01.01.0001 12:00 AM PDT
If you didnt completely format your computer, then I know a way to recover your cdkey (or better: the cd key hash) from the windows registry.
I´m not going to explain the entire procedure now. Search the Windows Registry for "Halo" and if it comes up with any hits, send me a pm and I´ll explain it to you further.