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Windows.old is not a boot partition, it's just backup files. To actually be able to dual boot follow this guide.<br />
<a href="http://lifehacker.com/5126781/how-to-dual-boot-windows-7-with-xp-or-vista" rel="ugc">http://lifehacker.com/5126781/how-to-dual-boot-windows-7-with-xp-or-vista</a>
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Windows.old is not a boot partition, it's just backup files. To actually be able to dual boot follow this guide.
http://lifehacker.com/5126781/how-to-dual-boot-windows-7-with-xp-or-vista [http://lifehacker.com/5126781/how-to-dual-boot-windows-7-with-xp-or-vista]

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I remember some time ago when I reinstalled my Windows 7, windows automatically made dual boot with the new one and the old one. &nbsp;But it didn't this time. All I need is some stuff from the registry..
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I remember some time ago when I reinstalled my Windows 7, windows automatically made dual boot with the new one and the old one.  But it didn't this time. All I need is some stuff from the registry..

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you can even run <i>msconfig</i> and edit boot order 
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you can even run msconfig and edit boot order

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After much research, regeditpro saved my day.
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After much research, regeditpro saved my day.

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I recently reinstalled my Windows 7, did not format it, that means that the files are all there on C:\Windows.old, but it doesn't show as dual boot.<br />
<br />
How can I configure a dual boot option to boot in my old and new Windows 7? 
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I recently reinstalled my Windows 7, did not format it, that means that the files are all there on C:\Windows.old, but it doesn't show as dual boot.

How can I configure a dual boot option to boot in my old and new Windows 7? 

[Windows 7] How to dual Boot Windows.old?

Windows 7 is an operating system from Microsoft. Features include multi-touch support, a redesigned Windows Shell with a new taskbar, referred to as the Superbar, a home networking system called HomeGroup, and performance improvements.

Windows 7

The Microsoft Legacy Operating System topic includes legacy versions of Microsoft operating systems prior to Windows 2000: All versions of MS-DOS and other versions developed for specific manufacturers and Windows 3/3.1, Windows 95 and Windows 98, plus any other Windows-related versions, and Windows Mobile.

Microsoft Legacy OS

Operating systems perform basic tasks, such as recognizing input from the keyboard, sending output to the display screen, keeping track of files and directories on the disk, and controlling peripheral devices such as disk drives and printers. For large systems, the operating system makes sure that different programs and users running at the same time do not interfere with each other. The operating system is also responsible for security, ensuring that unauthorized users do not access the system. Operating systems provide a software platform on top of which other programs, called application programs, can run.