After installing Internet Explorer 9 a welcome page pops up in a seperate tab the first time you run it.  I ran into a machine where it kept popping up over and over.
To fix it:

  1. Click start and in the search box type gpedit.msc
  2. In the Local Group Policy Editor navigate to:
    User Configuration/Administrative Templates/Windows Components/Internet Explorer.
  3. Locate the “Prevent performance of First Run Customize settings” setting and double-click
  4. Click the “Enabled” setting and below that click the drop-down where it says “Select your choice.”  Select “Go directly to home page.”
  5. Hit ok then close the group policy editor.
  6. Close and open Internet Explorer and you should be good.