F-Secure anti-virus products do not detect any viruses by these names. However, these viruses are sometimes reported because CPAV (Central Point Anti-Virus) uses these names.
Based on the settings of your F-Secure security product, it will either move the file to the quarantine where it cannot spread or cause harm, or remove it.
When the heuristic scanner of CPAV thinks it might have found a virus from a boot sector, it calls it 'Viral Code B'. If the suspicous code is found from a file, it's called 'Viral Code F'.
This doesn't necessarily mean the files or boot sectors are actually infected, they might just contain suspicous code. In any case, you should have the files or boot sectors checked to make sure whether it's a false alarm from CPAV or a real virus.
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