If you're using Windows XP, Winsock fix might help your problem. Also, if you're using internet explorer, go to tools, connections, LAN settings, and check Automatically Detect Settings.
You can download Winsock Fix here:
MajorGeeks.Com - Contacting Download Site
Just remember, after you use that tool, it forces a restart. So make sure you save all your work and close out of any important applications.
If none of that helps, possibly re-installing internet explorer might help.
Hope that helps
