hi arsal try flushing your DNS cache (if you have my PM saved which I sent you some time ago..then read it again and perform those tasks..) or try:
Start Menu >> Run >> Type "CMD"
then when dos-prompt open, type "ipconfig /flushdns" then type ipconfig /renew..restart your PC..clear your browser cache then try again..
BTW, I am quite sure this is the problem of your ISP proxy server..
Thanks,