
Are you using Norton Security by chance? Or perhaps McAfee? If so, try disabling them just long enough to try again and see if that makes it work. What type of internet connection are you using? Dial-up, dsl, cable modem, etc... This may sound totally out of whack to you, but if you open internet explorer and go to the tools menu and select Internet Options, then click on the Delete button under browsing history, then click on Delete All, then select the box that says Also Delete Files and settings... and answer Yes.
This will clear out your cache and could possibly help with your issue.
Hope this helps, like I said it may sound silly but I have seen this clear up a lot of problems with internet connectivity.