In the vast majority of cases, fsmainui.exe is a safe, essential component of the Microsoft security infrastructure. It is a virus, spyware, or trojan.
It is the piece of software responsible for displaying the dashboard, settings, and notifications you see when you interact with the antivirus program. While it is a legitimate file from , it is often rebranded for various internet service providers, appearing in suites such as: Charter Security Suite KPN Veilig FS Protection Common Issues fsmainui.exe
: Use the Windows Startup Repair Tool or the built-in repair feature within the F-Secure installer. In the vast majority of cases, fsmainui
Even if you have F-Secure, use a portable scanner like or Microsoft Defender Offline to scan your system. This ensures the fsmainui.exe you see isn’t a cleverly disguised trojan. While it is a legitimate file from ,