the login should work with internet explorer (for most) or firefox (for everyone else). if one doesnt work for you try the other. if they both don't work then try only logging in by using the HBO desktop shortcut. if it still doesn't work, then i have no idea what's wrong, lol.
a BIG suggestion from me would be to add a warping item in the game. it's tiring running from windgrove all the way back to the city.