FAILED CFW 2.3.6.81 installation on windows 2003 enterprise sp1

Hi, although CFW supports windows 2003 server as to comodo.com; everytime, CFW does its own rollback at the final stage of install.
Anyone can post the essential requirements for that CFW can install itself successfully such as:

  • incompatible with other softwares.
  • windows services ?
    Thanks.
    (:KWL)