In most cases, it's due to your PC being infected with a virus. The first step is always to run a full anti-virus and malware scan.
Alternatively, something else on your PC is preventing MTA anti-cheat components from starting (For example: intrusive security software that blocks the MTA anti-cheat kernel driver due to a false positive of not trusting it).
If you are in this situation and try to join a server that enabled SD #16, which is opt-in, then you'll get kicked like you have been. Servers can enable this detection for additional security. If you really want to play on this server, then I advise you find what on your PC is causing this problem and it is probably Virus.
