|Other than typing your password when signing into Yahoo! or talking to Yahoo! personnel on the phone. Do not give it out to anyone trying to help you.|
(1) Internet Explorer->Tools->Internet Options->
Click the following buttons: Delete cookies. Delete Files (also button that pops up: Delete Offline Content). Clear History. If you save any cookies, history or offline content, then selectively delete the useless items. The cookie(s) for the site giving you trouble would be one to delete.
(2) Temporarily disable antivirus/ firewall and any popup blockers/toolbars. Check to see if that solves the problem. If it does, go through and isolate which program is at fault. Change settings in that program.
(4) Look for a file named HOSTS with no extension. (not Hosts.sam or Lmhosts.sam). Could be a hidden file so you will have to be sure Show All Files. Also, be sure to uncheck, Hide extensions for known file types.
These can be found in Folder Options. Start->Settings or Windows Explorer->Tools. Or on the View Tab.
You can open up a Hosts file and edit with notepad. Look for entries related to the problem site. Either delete or place a # at each related entry. The # symbol forces Windows to ignore that line. Save the new edited version to the location where it was found. Reboot and see if that was the cause of the problem.
(5) Index.dat files may be corrupted. Deleting them without a program varies between your version of windows. I would suggest using IE Privacy Keeper. Freeware.
(6) Click Start->Run. Type
regsvr32 urlmon.dll and then click OK. Repeat, substituting each of these additional DLLs: