Let's try this again. I'm not sure everything was disabled the last time.
Go to Start – Run - type msconfig – click OK and click on the startup tab. Uncheck everything there including your anti-virus program.
Then:
Select the "services" tab and check hide Microsoft Services
Uncheck all the NON Microsoft services and reboot normally.
Let me know if you can connect to those sites. Only do this briefly as your anti-virus will be disabled.
You will have to recheck it in msconfig and its services to start it back up.