Click the

button. In the Search box, type
Command Prompt, and then, in the list of results, double-click
Command Prompt.at the cursor type:
ipconfig /flushdns <-- (A space between g and / is needed)
repeat with
ipconfig /renewThen hit Enter, type Exit, hit the Enter key.
OR if this fails.
You may need to run
CMD - Command Prompt on Vista - Windows 7 with Elevated Privilege
http://www.mydigitallife.info/2007/02/17/how-to-open-elevated-command-prompt-with-administrator-privileges-in-windows-vista/<<<>>>
Make sure that no proxy settings are set.
In Internet Explorer go to Tools - Internet Options - Connections Tab - Lan Settings and remove the reference to
127.0.0.1:5577 if found, then uncheck
"Use a proxy server" and check
"Automatically detect settings".===
If you use Firefox in Tools Menu > Options... > Advanced Tab > Network Tab > Connection > Settings. Select the Auto-detect proxy settings for this network option. Or no proxy if you do not need it.
===
Keep me posted.