to resume what I knwo about this game :
– mw3 is mostly a dx9 game
– mw3 is a 32 bit game
– mw3 on 7 / 8.1 may activate some dx11 features (AA ,AO, etc…)
– you lool like to be on a laptop
the message “compatibility fixed” is intented to avoid a DX9 isolation introduced on windows 8.
note that 8.1 is not very usual ,so we dont have a lot of feedback about it but you can try :
– check in game setting if you have any DX11 settings enabled
– try to attach Moss to the Intel GPU (see other threads for the howto)