O97M ("Office97Macro") is the family name of all Office 97 macro viruses. These viruses are able to infect two or more Office 97 applications. For example, O97M/Tristate is able to infect Word, Excel and PowerPoint files.
Once detected, the F-Secure security product will automatically disinfect the suspect file by either deleting it or renaming it.
More information on 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.