X97M/Button is an Excel 97 macro virus.
Allow F-Secure Anti-Virus to disinfect the relevant files.
For more general information on disinfection, please see Removal Instructions.
When an infected workbook is opened, X97M/Button.A infects all worbooks that are currently open in Excel.During the process, it creates a temporary file, "C:\cmdbutton.bas" and adds a button of a smiling face to the menu bar of Excel.
Technical Details: Sami Rautiainen, F-Secure