Now the virus Trojans that infect the exe program like to modify the system files. Normally, the anti-virus software can't restore the poisoned system files back to the original state. Is there any other way besides reloading and copying from other machines? You can also extract the most original and safest “original” files from the installation disk! However, the files in the installation disk can be created without copy/paste directly, and the extraction methods of XP and Vista/2008 are different because they use different installation methods. First, extract the XP installation disk files and carefully observe the XP installation disk files, you can see that most of the files in the i386 directory are "EXPLORER.EX_", such file names, in fact, it is a compressed file, file The name is the same as the extracted file name, but the extension and file size are different, so directly changing the suffix is not available. There are two ways to extract the file: Method 1: Decompress the file directly using a compression software such as 7-zip. The reason for mentioning 7-zip is that it is free, because it will integrate the "7-zip" menu into the right-click menu of all files (or folders) by default, which is very convenient to use. Of course, using WinRAR can also be decompressed. Method 2: Decompress the file using the Expand command that comes with XP in the window command line state. Usage: expand D: i386EXPLORER.EX_ C: explorer.exe, (Figure 1); meaning to extract the EXPLORER.EX_ file in the i386 directory of the D drive to the root directory of the C drive, and name it explorer.exe. The i386 directory is the directory where the installation files are located on the XP installation disk. This command is often used to restore the system under the recovery console. Second, extract the files in the Vista/2008 installation disk Vista/2008 uses a new installation technology, all installation files are stored in the sourcesinstall.wim file; this file can not be opened with the general software, can only use the imagex provided by Microsoft. The exe program opens. This program does not have a graphical user interface. It is now used as an example for Vista usage. Step 1: Run the command prompt as an administrator and use the CD command (for example: “CD i386” command is the i386 into the current directory. Directory) Go to the folder where imagex.exe is located. Step 2: Use the imagex/info h:sourcesinstall.wim command to view the system version included on the current installation CD. For example, the Vista installation disk has versions of Home Basic, Home Premium, Business, and Ultimate. When you see the Windows Vista ULTIMATE section, the image of index number 4 is the Vista ULTIMATE installation file. Step 3: Use the command such as imagex /mount g:sourcesinstall.wim 4 d:msdn to map the installation image with index number 4 in the G disk installation file to the d:msdn folder. At this time, opening d:msdn can extract the original file just like entering the normal folder, no need to extract it. Step 4: After using it, you need to uninstall the image. The commands corresponding to the above operation are as follows: imagex /unmount d:msdn. Tips: 1. If you can't use imagex.exe, go to the control panel → add new hardware and manually install WIMFLTR.INF. 2. The folder to which imagex is mapped must exist. If there is a file in the original folder, the file will not disappear after the mapping, but it will be upset by Vista's installation file "camouflage".