I'm no expert, but I'm pretty sure you can't uninstall individual patches. And I don't think you'd be able to install only up to 1.06. But you'd start by uninstalling the game. Turn off your internet connection and then reinstall. You won't be able to play any online modes afaik. So have fun.
I'm still not sure why people are having an issue with hitting. I usually play on AS with a little HoF mixed in and haven't had any issues.
Maybe try here for some help:
http://www.operationsports.com/forum...d.php?t=909723