1) The computer starts or runs slowly.
2) Pop-up advertisements or various error prompts often appear on computers.
3) Computer security software can't be opened or failed.
4) The passwords of all kinds of login software requiring passwords are changed or abnormal login is displayed.
The above four are the most common symptoms, but there are more than these.
How to find the virus now.
1) Computer viruses like to use meaningless numbers and letters as process names, such as "exe4322.exe" and "a563343.exe". However, it should be noted that the calling process of some games is the same, such as BF2. In order to avoid misjudgment, you can check the progress table after ending various games and other applications.
2) Viruses like to add themselves as an automatic startup process. You can check the software with 360 security guards and other software. At present, most of this kind of software will prompt whether the startup item is safe, and you can close the dangerous startup item according to the prompt.
3) Check antivirus in safe mode, press F8 to enter and follow normal antivirus steps.
As for virus prevention,
1) Install antivirus software, and personally recommend Kaspersky, NOD32, Norton, and McAfee. Kaspersky, in particular, is the leader in virus defense. The disadvantage is that it is too soft, as the name implies. Rising, Jinshan and Jiang Min in China can all be considered, but the effect is not ideal, and it is particularly easy to be killed by viruses.
2) Develop a good habit of surfing the Internet, keep security software open at any time, download software from well-known websites, and pay attention to the safety tips of security software.
3) Patch regularly. Nowadays, many highly spread viruses are spread through WIN system vulnerabilities. If patches can be updated in time, many virus attacks can be avoided.
4) Personal computers should be used for personal use as much as possible. If someone else uses it, especially the USB flash drive on your computer, you should start the automatic scanning function of the USB flash drive of the antivirus software.
PS:
Computer is a developing industry, and there is no absolute security. We can only reduce the danger by various methods. In addition, while playing computer, we should learn and understand computer as much as possible to avoid computer failure and poisoning to the maximum extent.