Is Comodo compatible with Windows Vista?
It will be when version 3 arrives in a month or so.
As Soyabeaner said, Windows Shista will be allowed to use CFP on V3.
Melih said that 16 april is the magic day for the first beta of v3.0 (if nothing goes wrong)
For more information on Windows Vista and Windows x64 compatibility please check the post HERE.