What can happen when Win7 is invaded by malicious software?

First phenomenon: Browser home page connection is tampered with

If you do not adjust but found that the browser's default home page changes, it is likely that the system infected with malicious software. Similarly, or use Baidu Search, click Baidu to provide the connection, but was directed to a random connection, but also the system is infected by virus or malware performance.

　Second phenomenon: Browsers cannot surf the internet

Network connectivity is normal, but there is no access to the Internet problem, it is very likely that the system was infected with malware. All we have to do is double-check the settings and go into the browser's network connection project to make sure the proxy server is not set up. If you confirm that you are not using a proxy server, it is because the system is infected by malware.

The third phenomenon: focus on window Tips

In general, a potential sign of malware infection will appear in the window, sometimes pop-up pornographic windows, unexpected pop-up windows, especially in the absence of a Web browser to appear in the window, is the system has been infected with malware a sign that the system must be restarted to enter into Safe mode, Use powerful anti-malware tools to remove them.

Fourth phenomenon: Systematic performance has a downward trend

The most annoying thing about malware is that it causes system performance to degrade, whether it's a network connection or the speed at which the application is running. Of course, only the performance degradation of the system does not mean that the malware infection, but also most likely caused by other reasons, such as disk fragmentation, system garbage, and so on.

First of all, we should eliminate other possible, take measures to deal with the problem of system performance degradation, the usual measures are disk defragmentation, cleaning garbage, increase memory, etc., if the necessary measures after the system performance is still not improved, it is likely that the malware caused by the problem.