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Notes:
1) In part one of this article I Used a blank 640GB hard drive and created two partitions (Partition option #2), the first partition is slightly smaller (275GB) and is where I started by installed the 32Bit version of Windows 7 Home Premium.

2) The second, unused and larger remaining partition is where the next version of Windows will be installed, which in part 2 is Windows 7 Professional 64Bit.

3) Installing the second version of Windows is almost identical to the steps you following in Part 1. Each step will be included in part 2, however only the screen shots that are unique to the second installation will be included.

4) After completing the installation a utility named EasyBCD will be used to change the default wording of each entry in the boot menu to make it more obvious as to which version of Windows you want to select and load.

Step 2 - The next screen allows you to setup your language, time and currency format, keyboard or input method. Choose your required settings and click next to continue.

Step 3 - The next screen allows you to install or repair Windows 7. Since we are doing a clean install, click on "Install now".

Step 4 - Read the license terms (pay particular attention to paragraph 1 which is the basis for why you need 2 product keys for a dual boot computer) and click ‘I accept license terms’. Then click next to continue.

Step 5: What type of Installation do you want: There are two options to choose from, Upgrade or Custom (Advanced). Since you are doing a clean install, select the second option ‘Custom (Advanced)’.

Step 6: Choose where you would like to install Windows 7.

If when prepping the hard drive you choose option #2, the drive already has been partitioned and formatted. Therefore all you need to do is select the second partition (Volume name = Win7 64Bit).

Step 9: The next set of tasks are completely automated, no user intervention is required. You will see a starting Windows logo, a “Setup is updating registry settings” message quickly followed by a “Setup starting services” message, finally the “Completing installation” message is displayed (your screen may flicker).

Your computer will reboot at this point in the installation process.

Setup will now prepare your computer for first use and check your video performance.

10) You will now be prompted to enter a user name and a computer name. Your username “Should Not” be the same as the name you choose for the first installation. It also will be will become the prefix for the computer name, I suggest you also change the computer name to indicate which version and bitness (64Bit in this case) is being installed. Click the ‘Next’ button to continue.