After installing Windows 7 as a dual-boot setup, it’s automatically set as the default boot option (shown at startup). The default Operating System starts automatically after the specified timeout period elapses. If you want to unset Windows 7 as the default boot option, use the System Configuration Utility in Windows.

Start Windows (Windows 7, Vista or XP)
Click Start, type MSConfig.exe and press ENTER
Click the Boot.ini tab
Select an Operating System and click Set as default

Click OK
Note that this is not specific to Windows 7, but also applies to Windows 2000/XP/Vista.
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there is no entry under ‘boot’ tab.. :-((