I bought a Dell Inspiron 17R and it came with windows 8. Yesterday Windows Update showed a message asking me to update to Windows 8.1, wich I have done. But now a message keeps showing asking me to activate Windows and asking for the product key. The thing is, this laptop didn't came with the label with the product key, and for what I've been searching this number is in the BIOS. How can I retrieve this number so I can insert it on the settings?