Invalid Game Data?

actually, i had that same exact problem. As expected, P4f has glitches(noduh) cause it is a beta. dont expect that much its not even close to bf2 or bc2

keep restarting (the game), i dont think you really need to reinstall the whole thing, restarting worked for me. If by all means it does not work then reinstall. if reinstall doesnt work then check ur sys specs/drivers, if they match then its the games faulty coding

Same here.

It was happening to me as well but i had a salution, I tried it with WinJect and then without it. If i may recommend that to all that read this "Do NOT inject on Main Menu, Inject your AimBot and or WallHacks while IN-GAME." Hope that helps a bit.

And for a wall hack, i very much recommend Daavid's Visuals 2.1. Thats what i use and it works great, a little buggy somtimes but its still good.