Today I´ve the same problem when I open Frontpage after install other programs but I saw the solution in moco..ops! microsoft and probably the cause is other program overwrite Msvcirt.dll, Msvcrt.dll or both .dll. See this link
http://support.microsoft.com/default.aspx?scid=kb;EN-US;Q296551Sorry for my english, and I expect you resolve the problem as me.
Saludos