Most F-Secure products include a repair tool.
fsmainui.exe is a "good guy." It’s the bridge between you and your antivirus settings. As long as it’s sitting quietly in the background and signed by F-Secure, you can let it do its job. fsmainui.exe
(If you want, provide the file path, file properties, or a screenshot and I’ll give a more specific assessment.) Most F-Secure products include a repair tool
Even though the file is safe, users sometimes encounter errors. Here are the most frequent issues: provide the file path