I don't think you should report bugs while using Windows 7 because
ArmA 2 does not support Windows 7 as the OS is not released yet
some bugs might be because of Windows 7 and you will have to wait for the final version of Windows 7 to be released.
I got my ArmA2 working with Windows 7 but I can't install any patch for the game, it will make the game start crashing.