Well jus try updating the S&D 1.3 after sumtime ,U dont need to reinstall it..coz sumtimes wen the server is busy then u get the msg "BAD CHECKSUM" otherwise there is no problem with ur S&D 1.3 as i also face the same problems even thou i hv a BROADBAND Connection....
IF u hv already allowed to "PERMIT" the S&D wen ur Firewall asked it then u need not do it again... Its jus that the servers are busy bro.. ! jus try sum other time..
Cheers n e-peace....