IE Search for highlighted text. right click on highlighted text and search using a search engine. 

Manual Installation

    * Save this document as "search.htm" in a folder of your choice.
    * Select Windows "Start", then "Run" and enter "regedit".
      (RegEdit allows you to edit your registry.)
      **********************************************************
      NOTE: Be VERY careful when using RegEdit!! Editing the wrong values
      can cause problems running Windows or other programs!!
      **********************************************************
    * Navigate to the "Internet Explorer" key as follows:
      (Note: "keys" are the labels in RegEdit's tree list)

          - HKEY_CURRENT_USER
              - Software
                  - Microsoft
                      - Internet Explorer

    * You should see a key inside "Internet Explorer" called "MenuExt".
    * If not, add a new key as follows:
          o Right-click the "Internet Explorer" key.
          o Select "New", then "Key" from the menu options.
          o Give the key the name "MenuExt".
    * Expand "MenuExt", (double-click it).
    * Add a new key with the name "&Search".
      (This string will be displayed in the browser's right-click menu.)
    * After adding the key, double-click the "Default" value on the right
      hand side of the RegEdit screen.
    * Change the Default value to the full path to the saved search.htm file.
      (e.g., "c:\docs\search.htm" if you saved search.htm in c:\docs)
    * Next, right-click the "&Search" key, select "New", then "DWORD Value"
    * Give the new "DWORD Value" the name "contexts".
    * Double-click the new "contexts" value on the right hand side,
      and change its value to "7e", (Hexidecimal).
    * Exit RegEdit and close all instances of Internet Explorer.
    * When you next open Internet Explorer, right-click menus should have
      a "Search" option. This option will open a new window and search
      for the currently highlighted text or hyperlink in Google.

You can use this automated setup program: http://www.jfitz.com/tips/search10_install.exe to install this script, or you can install it manually by following the instructions below.