Avast not updating automatically
If you require a copy of avastui.exe, it is recommended that you obtain it directly from Avast! These troubleshooting steps get progressively more difficult and time consuming, so we strongly recommend attempting them in ascending order to avoid unnecessary time and effort.Sometimes and other EXE system errors can be related to problems in the Windows registry.Keeping track of when and where your error occurs is a critical piece of information in troubleshooting the problem.problems can be attributed to corrupt or missing files, invalid registry entries associated with Avastui.exe, or a virus / malware infection.In fact, one misplaced comma can prevent your PC from booting entirely!Because of this risk, we highly recommend using a trusted registry cleaner such as Win Thruster (Developed by Microsoft Gold Certified Partner) to scan and repair any avastui.exe-related registry problems.
Furthermore, there's a possibility that the error you are experiencing is related to a component of the malicious program itself.
EXE ("executable") files, such as avastui.exe, are files that contain step-by-step instructions that a computer follows to carry out a function. Because of their usefulness and ubiquity, EXE files are commonly used as a method of delivery for virus / malware infection.