Try those solution,maybe it works.I Had this problem only 1 time:
-Run As Admin
-Move MW2 folder to Desktop so it has all permissions to write
-Install .NET Framework 4 if you don't have it
-Update your drivers
-Update your OS (This worked for me)
Hello all!After installing AlterIwNet all is working great,except SP and Spec Ops.It says "IWNET_INVALIDVERSION".If i turn off Internet Connection,start the game,turn on again the internet it's working..but it takes about 10 minutes :/
Is there anyway to fix this?It's not "Very Important" But if someone have a fix please reply to this topic
Thanks in advanced
Have a nice day