How to dual boot Vista and Windows 7

Both Vista and Windows 7 can easily co-exist on one machine, and the process is easier than you may think.  It’s as simple as making sure both operating systems are installed and running efficiently, as well as configuring your system boot-options effectively.  Here’s how it’s done.

For the purpose of this tutorial, we’ll assume you’re running a machine with Vista as the primary OS, and you simply want to add Windows 7 alongside Vista on the same hard disk.  To do this, the process involves shrinking Vista down to as small as you can get it to accommodate Windows 7, installing the new OS and configuring some simple options to determine your new system boot-methods (dual boot options).

The first step is to create enough room on your hard disk to accommodate Windows 7.  To do this, you first need modify the Windows Vista system partition to allow for as much room as possible.  There’s a variety of options available to do this, but the simplest and most effective is to use the built-in “Disk Management” functionality in Vista.  Before moving forward, make sure you backup the drive you’ll be working on – both partitions and data – to be safe.

To access Disk Management in Vista, right-click on “Computer,” and select “Manage.”  In the “Computer Management” window that appears, expand “Storage,” and click “Disk Management.”  Right-click on the primary partition (usually your “C:” drive), and select “Shrink Volume.”  A new window will appear with some options.  By default, the values listed will shrink Vista considerably.  In most cases, you shouldn’t have to modify the values at all, just make sure there’s at least 10GB free after you shrink Vista down.  10GB is the minimum free space needed to install Windows 7.  Click “Shrink,” and Vista will go to work.  After it’s finished, check the free space available on your primary disk to make sure enough room has been freed up.  While 10GB is the minimum, it’s a good idea to have much more available if possible.

Once space has been cleared on your primary drive, it’s time to re-boot and install Windows 7.  Insert your Windows 7 Install-DVD and restart your system.  Once booted back up, the installation will begin.  There’s two option that will appear; upgrade and custom.  Chose custom and click “Install Now.”  After a while, you’ll be prompted to chose the install location.  There should be at least two options: a partition marked as “Primary” and “Unallocated space.”  Select the unallocated space and click “Next.”  The install should finish without any more user input from you, and install Windows 7 alongside Vista on the same primary-drive partition.

Now that both operating systems are installed, it’s time to configure your boot options or “Bootloader.”  Once Windows 7 is completely installed on your system, it will automatically reboot and present you with a boot-menu with options for both “Windows Vista” and “Windows 7.”  Windows Vista and Windows 7 use the same bootloader, so the Windows 7 boot entry is an addition to the existing bootloader rather than a replacement as with a Windows XP-based dual-boot scenario.  This makes things a lot easier, but they both read the bootloader slightly differently.  If you simply wanted the option to either boot Windows Vista or Windows 7 upon start-up using the on-screen boot-menu, you should be good to go.  If you want to modify the bootloader in the future to change the way your system handles the dual-boot process, just boot into Vista, launch a command prompt and type “BCDEDIT.”  To launch a command prompt, click “Start,” go to “All programs,” click “Accessories,” and choose “Command Prompt.”  If UAC is turned on, you’ll have to right-click “Command Prompt,” and choose “Run As Administrator.”

A Vista/Windows 7 dual-boot scenario is actually the easiest of which to setup and operate being that they both share the same bootloader.  If you’re looking for nothing more than the option to use one OS over another at any given time, having a boot-menu launch at startup is the easiest way to go about it.  Making both operating systems co-exist and run efficiently is actually a relatively painless procedure, and one that will give you the many benefits of Windows 7 without having to give up Vista and all its subsequent settings, files, etc.

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