Windows 7 installation methods can be divided into: CD installation method, analog CD-ROM installation method, hard disk installation method, USB flash drive installation method, software boot installation method, VHD installation method, and so on. Different methods have their own advantages and disadvantages. Before installing the system, it is important to prepare the necessary emergency disk and backup of the old system. In case of installation problems, it will not be caught off guard. The following is detailed as follows: First, the CD installation method is brief: the CD installation method can be regarded as the most classic, the best compatibility, the easiest to learn installation method. Upgradeable installation, or new installation (optional formatting of the old system partition during installation), flexible installation. Flexible to install 32/64-bit systems without the limitations of the old system. Method: 1. Download the ISO file of the relevant system installation disk and reserve it. (There can be omitted from the CD.) 2. Boot into the BIOS (normally press DEL or F2 or F1 during hardware self-test, different computer settings), set to drive the CD-ROM first. Press F10 to save and exit. 3. Put in the CD, restart the computer, and boot the CD into the installation interface. Install by the appropriate options. When you choose to install a hard disk partition location, you can select a blank partition or an existing partition and format the partition. Others are not detailed. Disadvantages: In the case of the WIN7 test version, this disc installation is undoubtedly the most extravagant, wasteful, and least environmentally friendly method. It is recommended only if it is not available or is not suitable for other installation methods. Second, the analog optical drive installation method (in some cases may not be installed successfully) Brief description: analog optical drive installation method is the simplest installation, fast installation, but more restrictions, recommended for multi-system installation. Method: Load the ISO file of the system with the analog optical drive program under the existing system, run the installation program of the analog optical drive, enter the installation interface, and leave enough space for the C drive during the upgrade installation. Multi-system installations preferably install the new system to a new, blank partition. Disadvantages: 1. Since the existing system disk cannot be formatted during installation, a single system clean installation cannot be achieved. Because the old system files take up space, it also wastes disk space. Have an old operating system. 2. Because the old system partition cannot be formatted, residual virus files may compromise the security of the new system. 3. The old 32-bit system cannot install a 64-bit system, and the old 64-bit system cannot install a 32-bit system. Third, the hard disk installation method (in some cases may not be installed successfully) Hard disk installation method can be divided into two types: 1, the simplest hard disk installation method: extract the system ISO file to other partitions, run the SETUP.EXE file under the decompression directory, Follow the steps and no longer detail. This method has the same limitations and disadvantages as the analog optical drive installation method. It is also impossible to format old systems and 32/64-bit different systems cannot be mixed. Recommended for multi-system installations. 2, the classic hard disk installation method: (similar to the PE boot principle) Brief description: the installation is relatively cumbersome, the installation speed is faster, can achieve a clean installation, and the difference with the method 1 is that the old system files will not remain, but the same 32 /64-bit different systems cannot be mixed. Method: Decompress the system image ISO file to other partitions. According to the old system, it is divided into the installation of XP system and the installation of VISTA and above. 1, XP and the following system installation, copy the installation directory to the root directory of the C drive: BOOTMGR, BOOT, EFI two folders, BOOT.WIM under SOURCES (located in the C disk SOURCES directory), run the following command: C :\\bootbootsect /nt60 C: Restart the computer to boot into the WIN7 computer repair mode, select the DOS prompt, delete all the files under the C drive, run SETUP under the installation directory to install. 2, VISTA above system installation, do not have to copy the above files, directly reboot into the computer repair mode, select the DOS prompt, delete all files under the C drive, run SETUP under the installation directory to install. Disadvantages: 1, 32/64 bit different systems can not be mixed, because the SETUP and BOOTSECT programs of different bit widths can not run in the ectopic environment. Fourth, the USB flash drive installation method (not a mass production USB flash drive, strongly recommended! The method is super simple) Brief description: U disk installation method and CD installation advantages are similar, but do not need to engrave. Compared with other installation methods, the benefits are: 1. Not affected by the 32/64-bit system environment. If you install 64-bit WIN7 on a 32-bit old system, or 64-bit install 32-bit WIN7, you will find that SETUP cannot run because the 32-bit system cannot run 64-bit programs. This method can solve various incompatibilities and is faster to install than the disc. 2, USB flash drive can be used as a rescue disk: In case the system fails to start the system due to various reasons, then your USB flash drive is your first aid disk:) 3, easy to carry, one preparation, multiple installations. Can be deleted at any time without using it. There is a new version, update the file. 4, this method is also applicable to card readers and mobile hard drives, especially mobile hard drives can greatly improve the installation speed. 5, can achieve dual system, or a single system clean installation (format C disk when installed). This is determined by the options at the time of installation. As long as the computer can boot from USB, the installation compatibility is best (comparable to CD installation). Method: 1. Format the USB flash drive under VISTA/WIN7/2008, and set the U disk partition as the boot partition (this is the key to successful boot installation!), method: & ldquo; computer & rdquo;-> “ management & rdquo;- >“Disk Management”->Point USB partition, right click->“Format” and “Set as active partition”. “Disk Management& rdquo; Unable to use disk tool software to adjust. The traditional DISKPART method is not a necessary method, and it is not applicable to most people because of the command prompt operation. 2. Decompress the ISO image file of WIN7 into the U disk. The simplest is to directly decompress the USB flash drive with WINRAR. Or use a virtual optical drive to load and copy into a USB flash drive. The USB flash drive installation disk is now complete. 3, the computer is set to USB flash drive (old computer USB-HDD set to the first boot, the new computer from the boot drive select the preferred disk priority, depending on the BIOS), press F10 to save and exit, restart the computer, follow the prompts to install the step by step. 4, only for the lack of USB flash drive capacity: you can only extract the key boot file (refer to the hard disk installation method, including BOOTMGR, BOOT, EFI two folders, BOOT.WIM under SOURCES, a total of 200MB), and all the map Decompress the in-file to the other partitions of the hard disk. After booting successfully with the USB flash drive, select the computer repair mode, enter DOS, run the SETUP under the hard disk WIN7 installation directory to install, but the installation will be more troublesome. Disadvantages: 1, the biggest drawback is the need for a USB flash drive or mobile hard disk (believe this is not a problem for most people). 2, very few computers can not be booted by USB (I have not encountered anyway), this situation has to be honest and practical other installation methods. Five, software boot installation method (in some cases may not be installed successfully) Description: need external software to guide (see attachment), no 32-bit /64-bit limit, can be single system or multiple systems, can be pure system clean installation, installation The process is simple. Method: 1. Use the virtual CD-ROM to load the system ISO image copy installation file or directly use WINRAR to extract to the root directory of the non-system partition of the hard disk (not the folder!) 2. Download the attachment and run it, select mode 1 or 2 according to the old system environment. (Hint: If you need to uninstall Nt6 hdd Installer after the final installation of multiple systems, it is best to uninstall in the old system). 3, restart the selection of Nt6 hdd Installer automatically enter the installation interface, no longer detailed. Installed on other partitions into a dual system, format the C drive as a single system. Disadvantages: 1. External software is required. 2. A specific system environment/boot environment may cause boot failure. VHD installation method Brief description: VHD is a kind of virtual hard disk file format of MS. WIN7/2008 has already supported VHD format from the bottom of the system, so it can boot and select the operating system in VHD. This resulted in a completely new system installation method, copying the VHD, importing the VHD, modifying the boot file, and entering the 7/2008 system. Because this method uses fewer people, it is more abstract and will not be detailed. Interested friends can find relevant information on their own