im using windows 7 x64 and have no problem connecting it.. have u installed Kies (from the samsung site) and installed drivers?
updating via Odin is the best way to update ur phone's firmware.. and to do this, u need a usb connection yes..
im not sure wat u mean by the bottom part of the screen, but if ur talking about the app dock, there are alternative launchers that u could try.. Go launcher is one of the best, i hear.. and launcherpro..there are quitea few other good ones that u might wanna try out urself
btw. battery life is pretty impressive once u update to a new official firmware (anything newer than KG5 is great)