If you do not need the instant search in Start menu to look through say all of your conversations or such, you can fine tune it.
1) Right click on the Start Button and choose "Properties". Under "Start Menu" tab, click on "Customize". You'll see something like this:
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2) That's where your options are. Uncheck what you need and what you don't need: Search through files, Favorites and history, Communications? The choice is yours.




