Sorry if I haven't provided enough information; please help as much as you can, we really want to play.
My OS is Windows 7.
My friend's OS is Windows XP.
New here? I'm Roha — want a quick tour?
You must have the same versions of Heroes installed, with the same patches and scripts. Also, you need a patch for online play. If it still kicks you out after checking everything, the problem is with Windows 7.