C:\Program Files (x86)\F-Secure\ui\fsmainui.exe (or within corresponding partner brand subdirectories like Charter Security Suite )
fsmainui.exe relies on Microsoft Visual C++ Redistributables. Download and install the latest "x86" and "x64" versions from Microsoft’s official website.
If fsmainui.exe is causing high CPU usage, it is usually because it is actively displaying a large scan result, updating, or experiencing a conflict with another program. fsmainui.exe
If you’ve used other antivirus software, you’ve seen similar processes:
: A "0xc0000135" error often means the program cannot start correctly, which can happen if system components like .NET Framework are missing or corrupted. C:\Program Files (x86)\F-Secure\ui\fsmainui
Launch your F-Secure app from the desktop shortcut to see if it refreshes normally. Step 2: Use the Official F-Secure Uninstallation Tool
Right-click the file in File Explorer, select Properties , and look for the Digital Signatures tab. It should be signed by "F-Secure Corporation." Common Issues: High CPU or Crashes If you’ve used other antivirus software, you’ve seen
. If you do not have these programs installed and see this process running, it is highly likely a malicious file and should be quarantined immediately. BleepingComputer Are you seeing high CPU usage error messages specifically related to this file? How to remove a computer virus or malware - Kaspersky
Are you tired of encountering errors related to fsmainui.exe? Do you want to understand what this file does and how to troubleshoot issues associated with it? Look no further! In this comprehensive article, we'll dive into the world of fsmainui.exe, exploring its purpose, functionality, and common errors. By the end of this guide, you'll be equipped with the knowledge to fix problems related to fsmainui.exe and optimize your system's performance.
If you do not use F-Secure, uninstall the program properly, and the file will disappear. If the file appears outside the F-Secure folder, scan it immediately.
Another peculiarity: after an in-place upgrade of Windows 10 to 11, fsmainui.exe sometimes spawns two instances. One is the legitimate UI server; the second is a zombie process left behind by a failed Fast User Switching event. Killing the second instance does nothing to security, yet users panic, assuming a rootkit.