Vista - Server Connectivity Loss in Windows Vista

I just upgraded to Windows Vista Business (RTM) and When I attempted to setup
Outlook Express and when I attempted to send mail, and when I attempted to
get connection to server to this site for establishing my profile, Windows
Vista seems to create a hang up in connectivity causing some errors to be
read. Also causing my Cable Modem to become unstable in connection. Does any
one have issue with hang ups in connections or Cable Modems loses in
connection because Vista sends either too much, or sends wrong pattern
information? I don't know what is causing this. I ran the OS of Windows Vista
RC1 Ultimate (Build 5600) and had no problems at all. Now with full coded
software I get server connection difficulties. Also cable modem wants to go
blank when Vista sends too much. Any one there?
Thanks