This additional antivirus program might interfere with the process and might stop the installation process. Here are some reasons behind Avast installation stuck at 99: What Causes Avast Update Installation Stuck at 99? However, there are some issues associated with it: Avast offers a wide range of antivirus scan services. Some of the popular ones are Avast, McAfee, and Norton. Once an antivirus scan is done, these malware tools are disabled, quarantined, and deleted. Anti-malware & Antivirus programs routinely scan and safeguard your system. The unusual behavior of your operating system accompanied by unauthorized access indicates that your system is under malicious attack. There are several types of malicious software like viruses, worms, bugs, bots, spyware, Trojan horses, adware, and rootkits that are harmful to your device, be it your Windows PC or your Android smartphone. How to Fix Avast Update Stuck on Windows 10 Why is Antivirus Necessary?
