Dll file is a dynamic link library. If there is a Trojan virus on the computer, it may be infected by a virus.

You can open the security software such as Tencent Computer Manager, and determine whether the dynamic link library is infected through the virus killing function.

After virus killing, if some client software can't run due to lack of dynamic link library, just uninstall and reinstall.

Before killing viruses, the security software should be updated to the latest version, and the virus database of antivirus software should be updated.