This is a multipartite virus which infects MBRs on hard drives and COM and EXE files when they are executed. Occasionally the virus tries to play something (probably laughter) from the PC speaker. Yesmile is a stealth virus, so you can't see it in files or boot sectors when it is resident in memory.
There are several variants of this virus. The 5504 variant was distributed in a dropper called LAUGH.EXE in usenet newsgroups in January 1996. Do note that F-Secure anti-virus products do not specifically detect the LAUGH.EXE dropper: you will have to delete it manually.
Depending on the settings of your F-Secure security product, it will either automatically delete, quarantine or rename the suspect file, or ask you for a desired action.
More information on the scanning and removal options available in your F-Secure product can be found in the Help Center.
You may also refer to the Knowledge Base on the F-Secure Community site for more information.