What is your primary connection?
ADSL or DialUp?
If its ADSL, DSL, Cable or Fiber, try this:
Go into Internet Exploer
Click the "Tools" menu bar, and select "Internet Options"
Then click the "Connection" tab
Remove any dialup connections
and click "LAN Settings"
make sure than LAN is enabled and that the proxy is being automatically detected.
Click OK, and then click OK again
close Internet explorer
and start it again