Do not run multiple at the same time
Most importantly, don’t run more than one anti-virus, malware or spyware application at the same time. There are often users out there running two or three anti-virus programs at the same time, which means that every file that is accessed or opened is scanned more than once, which can significantly slow down your system’s performance and cause it to rattle. If an infected file is found, a scenario could occur in which both different programs attempt to quarantine the file. As a result, neither program will succeed, or one will succeed and you will see a number of errors indicating that there is a problem with the other program, when in fact the problem has already been solved. The point is not that two or three programs running is better than one.