The browser download channel has been used by Trojans. In this case, even if the browser is changed, it will not work. You need to use anti-virus software to detect the virus, and then select reset in the advanced settings in the Internet options of the browser.
Trojan horse, also known as Trojan virus, refers to a malicious code with special functions hidden in normal programs, which has special functions such as destroying and deleting files, sending passwords, recording keyboards, and attacking Dos.