How to build a secure PC system.

Install genuine antivirus software,,Disable all ports,,Find a firewall,,Set advanced passwords,,, etc,,If you want to type an article, it's best to go to a bookstore and buy a book.

Installing a VMware will not delay daily use.

Firewall and anti-virus software are enough, but installing too much will cause the system to be sluggish and stuck, and it will also lead to conflicts. In fact, as long as the personal computer manages the firewall, there is no fear of viruses at all, as for the problem of hackers, people hackers are idle eggs to invade worthless personal computers, even if you want to invade, you can only rely on your proficiency in the use of firewalls, I never use any anti-virus software.

4 words to solve the problem "do not plug in the network cable".

Then go and get a system restore tool, just like an Internet café, reboot and solve all the problems.

Delete the SAM file to recover the password.

As you know, the password of Windows XP is stored in the SAM file under WindowsSystem32Config where the system is located, and the SAM file is the password database file. When we log in to the system, the system will automatically check with the SAM in the config, and when we find that the password and username match the encrypted data in the SAM file, you can log in smoothly; If there is an error, you cannot log in. That being the case, we can recover the password by deleting the SAM file.

If you have two operating systems installed, you can use the other operating system that has access to NTFS to boot your computer. If you don't have two operating systems installed, you can use other tools to access NTFS, and then delete the SAM file in the C:WindowsSystem32config directory and reboot the operating system, at which point, the administrator will have no password.

Of course, it is also a good idea to remove the hard drive and replace it with another machine to delete SAM files.

Note: Windows NT 2000 XP uses the security manager (SAM) mechanism for the security management of user accounts, and the management of the security manager pair is carried out through the security identity, which is created at the same time when the security identity is created, and once deleted, the security identity is also deleted at the same time. Security identities are unique, and even if they are the same username, they are completely different each time they are created.

Therefore, once a piece is deleted, its security identity no longer exists, and even if it is rebuilt with the same username, it will also be given a different security identity and will not retain the original permissions.

The specific manifestation of the security manager is the %systemroot%system32configsam file. The SAM file is a database of user accounts for Windows NT 2000 XP, and all user logins and passwords are stored in this file.

It is often said that Windows XP is not stable enough from the foundation, and now we introduce you to the professional ways to enhance the security of Windows XP.

In Windows XP Professional, Microsoft has turned off or completely banned a lot of security features by default to enhance ease of use. This is equivalent to opening a lot of doors in your system, and you can even hack without the help of specialized tools. Taking user rights as an example, during the installation process, Windows automatically creates an unprotected Administrator account and adds the account of the person who performed the installation operation to the Administrators group.

This means that anyone who logs in this way gets all the administrative privileges.

This feature can also be borrowed by viruses that behave in the same way. But with a bit of common sense and the right tools, you can put otherwise vulnerable systems into a secure digital safe.

Check for hidden users

By default, Windows XP creates four pre-set accounts during the installation process: Administrator, Guest, Help Assistant, and Support, but many people don't notice this, as the User Accounts option in the Control Panel only shows two types of accounts: the user's own account and the guest.

If you want to see the full list of default accounts as well as user accounts, you'll need to run the Computer Management console unit under Administrative Tools and look under the Local Users and Groups node.

To solve this problem, simply cancel the user account'All administrative privileges, and follow the instructions below to set a strong, secure password for all accounts with administrative privileges This is a priority that you should focus on.

It is best not to show the welcome screen after booting the system, and in order to ensure that only authorized people can access the system, it is best to enter the system in the traditional Windows login interface way, which has been used since the days of Windows NT.

Control how access is conducted

To change the Welcome Screen option and add a password for the unprotected Administrator account. Press Ctrl+Alt+Del twice on the welcome screen to open the traditional Windows login dialog and type "administrator" in the username field. Keep your password blank, and if you can log in, your administrator account is not protected.