Try this 1.
1) As suggested by my friend "Ambucias" try accessing those sites putting them in
2) Click on Start --> In search box, type firewall.cpl and press "Enter".
"Windows Firewall Settings" window will be opened. Click on "Exceptions" tab -->
Check the check-box (Select the option) "World Wide Web Services(HTTP)".
3) If the problem still exists try disabling your firewall and antivirus temporary
then try to access the those sites.