• Click on Start Button
• Type Gpedit.msc, Group Policy Editor will open (Click Allow if prompted for elevated privileges)
• Navigate down and expand the following Tree Nodes User Config > Administrative Templates > "Windows Components" > Instant Search
• Double Click Custom Instant Search Internet Search Provider
• Choose to Enable
• Enter Search My SharePoint Site

• Enter http://YOURSERVER/searchcenter/pages/search_results.aspx?k=%w for URL.

  NOTE: The %w will be substituted at runtime with your search text url encoded.

  Replace YOURSERVER with your SharePoint server.

• Click OK
• Close Group Policy Editor
• Reboot or run the following command in a command window as Administrator gpupdate /force

請看 Vista Search & Organize Tip

非 Vista 的環境, 可以下載安裝 Desktop Search , 設定方法請參考

Tips to Enable SharePoint Intranet Search using Windows Desktop Search 3.0 RTW