Where to find my Windows7 7057 product key

I’ve decided to make a fresh install of my Windows today. I have a key from Microsoft, however I didn’t wrote it down and now don’t know
it. Is there any chance to get it back?
Thanks
Answer #1
Beta versions will expire in August with bi-hourly shutdowns starting in June. I’d get rid of it and install the RC or build 7127 which expires in 2010. Keys are available from the MS site directly or just a quick Google away.
Answer #2
Did you check your email?
Answer #3
Still hanged with 7057? Man you’re stubborn.
Answer #4
I agree with above.
I suggest downloading the newest RC version here. when you finish check your email as they send you a key via email.
http://technet.microsoft.com/en-gb/evalcenter/dd353205.aspx?ITPID=mscomsc
try these codes for your 7057 build. They may not work, and tbh there aren’t many keys floating around as this is an old build.
Serial number(s)/key(s) removed -
#3.14 Posting serial numbers or license keys in messages is not allowed.

Answer #5
It worked well and I didn’t had any reason to reinstall it. So I’d better get new serial number from somewhere.
I don’t have any mail containing a Product key, only one from Microsoft about the registration.