While Antimalware Service Executable isn’t a critical file for your system, it’s important to remember the role that it plays. MsMpEng.exe acts as a security guard for your system, monitoring and looking for spyware, viruses, and other hacker-created tools that could endanger your system.  If you are ready to take on that role manually, you might not need to use Antimalware Service Executable. Alternately, you could use a third-party software program to handle system security and checks.  If you decide to do this, be careful about where you download your third-party program and find one from a reputable company, as many so-called antivirus programs are actually viruses or spyware themselves.