Windows XP operating system 6 cases troubleshooting

1, why can't open the encrypted file

Q: I am using Windows XP system, two hard drives, from the disk to a zone, there are audio and video files on the disk and Windows XP comes with Encryption function encryption. Now the main disk has reinstalled the Windows XP system, the encrypted file from the disk can not be opened, what method or software can I use to open?

A: In Windows 2000, Microsoft adopted the Encrypting File System (EFS) based on public key encryption technology. In Windows XP, the encrypted file system was further improved to allow multiple users to access encrypted documents at the same time. However, while using EFS to encrypt files, it also causes a lot of troubles, such as the inability to open EFS encrypted folders after reinstalling the system.

In the absence of a backup key, it is almost impossible to decrypt EFS. Although there are many methods popular on the Internet, the feasibility is negligible. It is recommended not to waste time. Because in Windows 2000/XP, each user has a SID (Security Identifier) ​​to distinguish their respective identities, each person's SID is different and unique. When encrypting data for the first time, the operating system generates the user's key based on the SID of the encryptor, and saves the public key and key separately for the user to encrypt and decrypt the data. If you do not back up the current key before reinstalling the system, it actually means that it is impossible to generate the previous user key anyway, and decrypting the file requires not only the public key but also the key, so it cannot be Open the folder that was previously encrypted by EFS.

It is recommended that you back up the SID first so that it can be recovered in time when the system itself is damaged.

2, how to directly convert the partition format

Q: I have a question I would like to ask. My hard disk partition is in FAT32 format, but I want to convert the extended area to NTFS format. When I use the convert command under MS-DOS, I get an "Invalid Drive Specification" prompt, which makes it impossible to convert. What should I do without reinstalling the system? Is there any other method or software?

A: Windows 2000/XP provides the partition format conversion tool "Convert.exe". Convert.exe is a DOS command line program included with Windows 2000/XP. This tool can convert FAT to NTFS directly without destroying the FAT file system. Its usage is very simple, first switch to the DOS command line window in the Windows 2000 environment, type at the prompt:

D:>convert drive letter to be converted /FS:NTFS

If the system E disk is originally FAT16/32, now you need to convert to NTFS, you can use the following format:

D:>convert e: /FS:NTFS

All conversions will be in The system is completed after restarting.

In addition, you can also use a special conversion tool, such as the hard disk lossless partitioning tool Partition Magic, it is very easy to use it to complete the conversion of the disk file format. First select the partition to be converted in the disk partition list in the interface. Select the "Convert Partition" button from the interface button bar, or select the "Convert" command from the "Operations" drop-down menu in the interface menu bar. Activate this function interface. In the interface, select the conversion output as "NTFS", then click the "OK" button to return to the main interface of the program. Click "Apply" in the lower right corner of the interface to add settings. After that, the system will reboot and complete the conversion of the partition format.

3, centralized management of shared resources

Q: My company has shared resources in each computer, employees need to repeatedly log in to different computers in "Network Neighborhood" to access these shares Resources. In order to avoid trouble, some employees use the "mapping" function, but when the share name changes, the employee has to remap, it is still more troublesome. How can we make these shared resources centrally managed and accessed?

A: You can use the Windows Server 2003 Distributed File System (DFS) to centrally manage and access shared resources. DFS can index all shared resources in the LAN in a "tree" structure. By accessing the DFS tree, all resources in the LAN can be accessed.

There are two steps to using the DFS function: First, find a well-configured machine on the LAN, log in as an administrator and create a folder named DFS_SHARE in the Administrative Tools. Run the Distributed File System to create the DFS root directory. The second is to create a DFS link, add the shared resources provided on other computers to the DFS root directory, in the "Distributed File System" window, right click and click on the created DFS root directory, select "New" from the menu that appears. DFS link." After creating a shared link according to the prompts, all users on the LAN open the server providing the DFS service and the DFS root name in the "My Network Places" window, and you can see all the shared resources that have been added on different computers.

Of course, the network administrator can periodically update the shared resources in the DFS root directory.

4, "Network Neighborhood" does not display any content

Q: I use two Windows 2000 system computers to form a LAN, when they access each other's shared resources, "System Error 53" , the information about the network path could not be found, and nothing is displayed in My Network Places. How can I solve it?

A: This problem occurs because the "File and Printer Sharing" item in "Local Area Connection" is not enabled. The solution is to log in to the computer with an administrator account. In the "Network and Dial-up Connections" window, go to the Properties window of "Local Area Connection". On the General tab, in the This connection uses the following selected components area, verify that the File and Printer Sharing for Microsoft Networks service is enabled.

5, can not download DVD files

Q: I downloaded the business teaching DVD file in the FTP server, I found that my computer (Windows XP) can not be downloaded, always prompted an unknown error . But I found that in addition to this 4.7GB file, the remaining 1.4GB and 1.92GB DVD files can be downloaded normally. At the same time, I found that this file can be downloaded normally on the Windows Server 2003 server. why is this happening?

A: First check your computer, the partition that is ready to store 4.7GB DVD image file is not using NTFS file system, only the partition using this file system can allow a single file over 4GB to be stored. If your partition is in FAT32 format, then only after converting to NTFS format. This file can be downloaded on the server side because the server generally uses the NTFS partition format in order to fully activate the security functions of the operating system.

6, can not remotely log in to FTP

Q: I am in Windows XP, whether using IIS or Serv-U set up FTP server, the machine test is normal. However, other users in the company's LAN and users on the external network cannot log in normally. why is this happening?

A: Because FTP service is one of the important targets of hacking in the system, in order to prevent illegal FTP activation (such as hacking software to quietly start FTP service), Microsoft is designed in Windows XP built-in firewall. By default, external access to the FTP service is blocked. The solution is to enter the "ncpa.cpl" command in the "Run" field and press Enter. In the pop-up "Network Connections" window, select the network card (such as "Local Area Connection") responsible for LAN and external network connection, enter it. In the Properties dialog box, click the "Settings" button in the "Windows Firewall" section of the "Advanced" tab settings interface, and select the "FTP" item in the pop-up dialog box and click the "OK" button.