As mentioned previously, you need to remove all the xml files, some of which are not obviously part of the various Flashchat integrations.
These include:
- bitfield_fc_admincp.xml
- bitfield_fci_38.xml
- bitfield_ms_wic_addon.xml
- cpnav_flashchat.xml
I wasted about an hour on this today.
Maybe this info can help somebody save some time.
FlashChat was always a really crappy chat program anyway. I had installed it, and then disabled it due to poor communication and poor resource (ab)use. If you're wanting a quality chat program, look at AJAX Chat instead. Unlike FlashChat, it's behavior can be highly customized. (I'm not too keen on the default install, so I think customization is a must anyway.)
You'll find it here:
http://sourceforge.net/projects/ajax-chat