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After having this problem with our second computer and reading all the suggested solutions, I found a very simple solution. When first opening explorer, it will go to a site something like http://go.microsoft.com/fwlink/?LinkID=XXXXX, where X is a string of numbers. Close explorer. Then go to start-all programs-accessories-system tools-internet explorer(no add-ons). This opens explorer in a new window. Enter the address that explorer first tries to access, and enter. Voile! The set up site should appear where you can set the defaults, and problem solved! No need to add, delete, adjust any registry values or change any program settings. The problem apparently is caused by an add-on, such as an active-X control or something, which I haven't found, but IE now goes right to the home page.