How do I know if there is a virus in my computer?

For known viruses, after installing antivirus software, you can scan your computer to see if it is poisoned. If you have an older virus database, some antivirus software won't be able to detect it. Here's how to help.

One is to observe to see if your file icon has been changed, the disk or folder cannot be opened, the web page will automatically pop up when you open IE, whether the task manager is blocked, etc., these symptoms can be seen when you actually operate the computer.

The second is the feeling, which feels like your system is not very slow, and it takes a long time to react when opening a certain file or program. This is because some viruses can make your CPU usage reach 100%, and your system will naturally slow down when you run other programs. At this point, you need to take a look at your task manager to see if there are unfamiliar processes running, and if there is a process with high CPU usage.

3. Take the initiative to check, enter msconfig in "Run" to open the "System Configuration Utility", click the "Service" tab, all the selected services are started with your computer. See if these services are suspicious, or you can just look at the "manufacturer" item, as long as it shows unknown, it means that the service is suspicious (not necessarily a virus). If you're not sure, just look it up online.

Open the process manager, filter out the necessary system processes and common processes in the process, if there are redundant, and the name of the strange process, you should pay attention, and then when you boot up and do not run other programs that need to be networked, the network usage is always high, but also pay attention to viruses and Trojan programs! It's important to keep your antivirus database up to date! When the USB flash drive is plugged into the computer, it is necessary to pay attention to the viruses that run automatically and the viruses that are imported into the system at startup, and sometimes the antivirus software cannot defend against the viruses and Trojans brought into the system during manual installation!

Patch the system frequently, many viruses are invaded from system vulnerabilities, and often scan for Trojan viruses, the main antivirus software with a card or Rising, the auxiliary with 360 security guard, Windows cleaning assistant, do not go to the small **, but also pay attention to mobile devices, install firewalls, configure good rules, so as to greatly reduce the chance of viruses, but also reduce the risk of theft.

If your computer is slow, running an abnormal program, or keeps opening web pages, it is recommended that you update the virus database and check for viruses!

Check it with anti-virus software, and clean up the system if there is no virus.