How can I determine whether a computer exception is a virus?

Source: wangmeng

My computer often suffers exceptions such as crashes and slow running speed. I have used a variety of anti-virus software, but it does not take effect. How can I determine whether a computer exception is a virus?

Such examples are not uncommon, especially for some beginner computer users. Next, I will introduce how to determine whether a virus is detected in the following aspects based on my computer experience and enterprise network maintenance experience, hope to help identify "real virus!

Differences and connection between viruses and software and hardware faults

Computer faults are not only caused by viruses, but also caused by software and hardware faults, the network is mostly caused by permission settings. Only by fully understanding the differences and connections between the two can we make a correct judgment and discover the virus in time when it comes. Below I will briefly list some common symptoms of computer faults caused by viruses, software and hardware faults.

Possibility of symptom virus intrusion: Possibility of software and hardware faults

Frequent crashes: viruses open many files or occupy a large amount of memory; unstable (such as poor memory quality and poor hardware overclocking performance ); software running with large capacity occupies a large amount of memory and disk space. Some testing software (with many bugs) is used, and hard disk space is insufficient; when running software on the network, it may be because the network speed is too slow, the program running is too large, or the hardware configuration of the workstation is too low.

The system cannot start: the virus modifies the boot information of the hard disk or deletes some boot files. If the boot virus boot file is damaged, the hard disk is damaged, the parameter settings are incorrect, and the system file is deleted by mistake.

File cannot be opened: the virus modifies the file format, and the virus modifies the File Link location. File damage; hard disk damage; the link location of the file shortcut has changed; the software for editing the file has been deleted; if the file storage location on the server changes in the LAN, and the workstation does not promptly update the content of the server (the resource manager is opened for a long time ).

Frequent reports of insufficient memory: viruses illegally occupy a large amount of memory, open a large number of software, run the software that requires memory resources, and the system configuration is incorrect; the memory is not enough (the current basic memory requirement is 128 MB.

Tip: the hard disk space is not enough: the virus copies a large number of virus files (this has happened in several cases. Sometimes, when a WIN98 or WINNT4.0 system is installed on a top 10 Gb hard disk, the system says there is no space, when software is installed, the system prompts that the hard disk space is insufficient. The disk capacity in each partition is too small; a large number of large-capacity software is installed; all software is installed in one partition; the hard disk itself is small; if the system administrator sets the "Private disk" space limit for each user in the LAN, the system administrator can view the size of the entire network disk, in fact, the capacity of the "Private disk" has been used up.

When the disk or other devices are not accessed, the read/write signal is sent: virus infection; the disk removes the files that have been opened in the floppy disk.

There are a large number of unknown files: virus copy files, temporary files generated during software installation, or software configuration information and Operation Records.

Black screen startup: virus infection (the most important thing to remember is 4.26 in 98 years. I paid thousands of yuan for CIH. That day, when I first started Windows, the screen crashed, after the second boot, there will be no more); Display fault; Display Card fault; motherboard fault; overclocking; CPU damage, etc.

Data loss: the virus deletes the file; the hard disk sector is damaged; the original file is overwritten due to recovery; if the file is on the network, it may be deleted by another user by mistake.