Please help. Installing F-secure Safe on ntb HP in Windows 8.1 falls to 98%. Previous antiviruses have been uninstalled and FsUninstallationTool and restart have been used several times. All available Windows updates are installed.
Have you used the previous antivirus product's specific uninstallation tools? If not, I would suggest you try that, obviously rebooting after each stage, then try installing F-Secure again.