Thanks for the reply.
Cryptographic service is running and is set to automatic.
I had to format my computer to install new os "windows7".I did install windows7 used for few days then i had some problems, motherboard did not support it fully. so i had to downgrade to windows xp sp3.
After installing xp sp3, i encountered this problem.
This might not make a difference, but for the sake of getting it out of the way... check the HOSTS file entries and see if something is pointing it to the wrong place. Are you able to ping a few google services... gmail.com, mail.google.com, and see if you can hit them.