One of these are a Gears Beta key! The other one is a smelly Windows 7 phone prop :)
The first ? is 2 letters in the alphabet before the second one, good luck!!
66C4P-?WQCP-WFQR2-4C?R7-DRRVZ
GCTR4-X792Y-JPV3?-49?2G-4PDRZ
Sorta confused myself even... an example of what I mean is A and C could...