Problem starting ArmA2: Operation Arrowhead+Combined operations

[Problem starting ArmA2: Operation Arrowhead+Combined operations]

Yup, countless posts on that subject everyday, it would require a sticky.

maybe if they actually worked it would be okay :) Seems like some people think new problems don't happen on an evolving game.

Tried them all and replied to one which I have no clue what the guy was talking about. Hopefully that way will fix it.

[bin\config.bin/CfgInGameUI/MPTable.shadow Problem Please Help Me Out]

I have the same issue, but what does PvPscene mean by

Try to add this to your startup line again:

"-mod=C:\Program Files (x86)\Steam\SteamApps\Common\ArmA 2;EXPANSION;ca"

What's a startup line and where do I find mine? I'm a computer noob, so ALL help is appreciated. Thanks!

same please help