This virus may be related to the 'Klaeren' virus - at least it contains the same "bug", which prevents it from successfully infecting any file larger than around 4000 bytes. Longer infected files should be discarded, as they are probably unusable.
Once detected, the F-Secure security product will automatically disinfect the suspect file by either deleting it or renaming it.
Detailed instructions for F-Secure security products are available in the documentation found in the Downloads section of our Home - Global site.
You may also refer to the Knowledge Base on the F-Secure Community site for further assistance.