How to install XP on a pre-installed Vista PC and set up dual boot?

Nowadays, more and more PCs are pre-installed with Windows Vista at the factory, which brings a lot of convenience to users —&mdash Although the pre-installed Windows Vista is mostly a simplified version like Home Basic —— however, for many users, it may be more accustomed to Windows XP, and some applications that are used daily may not run in Windows Vista. Too normal, therefore, many people want to install Windows XP in the system, of course, the premise is that it does not affect the Windows Vista pre-installed in the system, after all, it is expensive to buy.
In the message of Vista World website and the e-mail received, the proportion of this issue is very large. Many users want to know how to install Windows XP on a PC with Windows Vista pre-installed, and set dual boot separately. Different systems, given our limited energy, cannot be answered one by one. Therefore, a brief summary of this, introduce the basic idea of ​​installing Windows XP on a pre-installed Vista PC, I hope to help friends.
Warning: Do not install Windows XP directly on a PC with Windows Vista preinstalled. It is well known that Microsoft has adopted a new system boot management mechanism and a new BootLoader in Windows Vista. It is different from Windows NT since Windows NT. The ntldr used in XP/2003, therefore, installing Windows XP directly on a PC with Windows Vista pre-installed will destroy the Windows Vista Boot Loader, as we said in the Windows Vista installation tutorial:
If you want to be on a PC In the case of using multiple operating systems at the same time, you must ensure that Windows Vista is the last installed system. Otherwise, if you install Windows XP after installing Windows Vista, Windows Vista boot loader will be overwritten by ntldr+boot.ini, resulting in Windows Vista does not start.
I hope to keep this in mind.
How to install Windows XP on a pre-installed Vista PC
The following describes the steps to install Windows XP on a PC with Vista installed:
1. If your PC hard drive has been split at the factory Partitions, you can jump directly to "Install Windows XP";
2, prepare a separate installation partition for Windows XP
In the factory settings of many PCs, the hard disk is not partitioned, that is, the system only contains “c : & rdquo; disk, especially on most laptops is extremely common. In this case, you need to split the hard disk first and prepare a separate partition for Windows XP.
a, open the disk manager, right click on the "C:" disk, select “ compressed volume & rdquo; in the pop-up menu, reduce the partition occupied by Windows Vista, adjust the space for the new partition. Note: You need to reserve enough free space for the Windows Vista partition;
b. Right-click on the adjusted “Unallocated disk space” and select “New Volume” to create Windows XP. New partition;
c, recommendation: It is best to re-adjust the system drive letter. For systems with only one partition, the hard disk is often used as “c:” and the DVD is “d:” The setting of the disk, in this way, the newly created hard disk partition drive letter is arranged in the order of "e:" disk, in some cases there may be some hidden danger. Therefore, it is recommended to re-adjust the drive letter at this time, such as setting the hard disk partition to “c:”“d:”, and adjusting the DVD drive letter to “e:”. Although this step is not necessary.