I tried to install Skype but I'm not too sure which one to install. Should I install the one for Fedora 7 or Fedora 6 Core? Again, I came across an error message "Malicious software can damage computer or cause other harm. Are you sure you wish to install this package? Details: Public key for skype-2.0.0.72-fc5.i586.rpm is not installed". I canceled the installation 'cause I'm afraid of it will crash my OS. Anyone has successfully installed Skype?