Thats a bummer man, I'm not sure what would be the best solution for this.
But I don't believe you can get that key from this system anymore. Since none of that Data was mostly likely moved over here.
Sorry man, I wish I could help you out better, but maybe someone else will see this and know more.
Edit: I think awhile back, someone wrote a program to help find your Key in the registry. I'm not sure if it would still work for you though.
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After a bit of Googling, I found the program you mentioned and it worked! It can be found [url=http://www.bungie.net]here[/url] if anyone was curious. Thanks for the help!