This post is a part 2 from the post  Installing Windows 7  Without Removing Xp


Start The Windows 7 Installation Process

First, restart your computer. When the computer starts the POST (checking for memory, drives,etc.), press and hold down the key combination that your computer requires to boot into the BIOSsetup move. On my particular BIOS is it the DELETE key. On other BIOS systems in might beF1 or F2. Use whatever key combination your system requires. Most of the time, you will see a message on the bottom of the screen in POST that tells you what key(s) to press to enter the BIOS setup.


NOTE: FOR THE FOLLOWING TO WORK, THE BIOS MUST SUPPORT AUTOMATICALLY ASSIGNING THE MASTER/SLAVE DISK DRIVES. IF YOUR DRIVES ARE SET BY PIN TO MASTER AND/OR SLAVE, THE FOLLOWING WILL NOT WORK. YOU MIGHT TRY REMOVING THE PINS, OR CHANGING THE SELECTION SO THAT THE BIOS WILL SELECT THE MASTER/SLAVE BOOT ORDER.


After your computer enters the BIOS setup move look for and select the ADVANCED BIOS SETTINGS, then select HARD DISK BOOT PRIORITY. The screen will display the installed internal Hard Disk drives on your system. You MUST KNOW the disk ID for the Hard Disk that you need to install Windows 7 on. Locate that drive, and select it as the FIRST boot device. The drive that contains your Windows XP installation MUST NOT be the first boot device. After selecting the proper Hard Disk drive to boot to, go to the BOOT ORDER menu, and select the Hard Disk Drive as the first boot device to check, then select the CDROM as the second boot device. Press F10 to close and save the parameters you just entered. The system will now restart.


Place the Windows 7 CD in your CDROM device, and follow the screen prompts to start from a CD/DVD.  This will take you into the Windows 7 installer, and you are on your way to installing Windows 7.


CAUTION: THE WINDOWS INSTALLER WILL PROBABLY PICK UP THE OTHER INSTALLED DRIVES ON YOUR SYSTEM! MAKE SURE THAT YOU SELECT THE NEWLY FORMATTED DRIVE TO INSTALL WINDOWS 7 ON, NOT THE DRIVE THAT ALREADY HAS WINDOWS XP INSTALLED ON IT.


Once you have completed the installation process you can use the built in Windows Easy Transfer program to transfer you saved data files from your Windows XP drive. You will have to install all of your programs on the Windows 7 drive because the Windows Easy Transfer program will only transfer data files.


If you desire to switch back and forth between Windows XP and Windows 7, by going into the BIOS setup and selecting the Windows XP drive as the first boot device. Then press F10 to exit and save the settings. The system will then boot into Windows XP. You can change back and forth by using this process.
 









 For more detail info,check out the link at the following address:

http://windows.microsoft.com/en-us/windows7/help/upgrading-from-windows-xp-to-windows-7