MGC Chatbox Evo - Causing Some Problems

[Probyte]

I noticed that I cannot edit the user group settings after I uninstalled MGC Chatbox Evo. It says there has been a database error, and I can completely see that it was caused by the chatbox.

It is uninstalled, but it still has the options to set it to the user groups, ect.

To uninstall it, I did the following.-

1.) Delete the product via the Admin CP.

2.) Delete all the files via FTP client.

How do I fix this?

Thanks,
Pyrobyte