Question of sketchy software on my Mac.

Hey guys, I had posted previously that my Ex stole my computer when I wasn't home. I went through the software and noticed 2 questionable downloads that I don't remember downloading. I have a Macbook Pro OSX version 10.5.8 2 G. One is called Kerberos Agent (which I thought was for Passwords) the other is called VNC guest and VNC drag helper. They were all installed on the same day. I didn't install them. (does Firevault protect against them and should I remove them? Any help would be appreciated.
Thanks

Sorry, I noticed I placed this in the wrong thread.

VNC can be used to remotely access your computer from a separate host. If you dont need that I would delete it straight away.

As has been suggested to you in the past..... Erase your HD, and reinstall your OS and all the software you need to from the install discs, and transfer all your docs, music, pics, vids, etc from your backup.

Thank you guys. I appreciate your help.