Win 7 key help

[Blowkewl]

So a few year back I bought win 7, then back in august of 2012 I got Win 8 beta.
So then in January I think it was windows was like you need to buy windows 8 full or we'll (Forgot what it said basically it was going to make windows annoying to the point where you would buy win 8 full) so I was like, Uh no.
and since my whole family started getting pissed at me because they were annoyed
with win 8 beta. So then I pirated win 7, yes I know I'm a horrible person, about a month ago and now it says it will do the same thing with win 8 if I do not activate key. Enough with my story my real question is can I retrieve the win 7 key I bought a few years ago since I lost the cd. Thanks.

EDIT:Forget I used sterjo key finder and the win 7 key on there didn't work

 

[Jaxem]

You'd need either:
-The System folder from the Windows 7 installation
-The key that came with the Windows 7 copy you purchased

Microsoft doesn't have any way to get a lost key to you, they feel you're responsible to hold on to it, though i have heard of cases where if you're sufficiently able to prove you had it and you whine enough they'll give you a new license key.