Try reducing the TIME_WAIT value in your registry. The TIME_WAIT value is governed by the TCPTimedWaitDelay Windows Registry setting.
If you're comfortable editing the Registry ........ Start > Run > type REGEDIT and hit Enter ............ search for TIME_WAIT and when you find it reduce it's value. See if that makes any difference.
If you're comfortable editing the Registry ........ Start > Run > type REGEDIT and hit Enter ............ search for TIME_WAIT and when you find it reduce it's value. See if that makes any difference.