open de folder scoutknivez it contains the file "_rank.gsc", delete the file
download the code from pastebin and save it as "_rank.gsc" put it in the folder where the other _rank.gsc was
change the mw2_modder.ini to this
;
;
;
[MW2_Modder]
; Choose the mod to load (by numbering defined below)
CurrentMod=0
; Define your mods here... numbered from 0 through whatever..
; The value on the right of the = sign is the folder containing the mod
Mod0=Scoutzknivez
Mod1=RealismMod
Mod2=Elitemod