Solution for URI issue anyone?

[eluser]JDG[/eluser]
I have just decided to make the change from ZF to CI but I have encountered my first problem. I have a fresh install and have tired to add my first controller and get the error message "The URI you submitted has disallowed characters."

I am using php 5.3 and searched around but wasn't able to find a solution. I guess my first question is, is there a solution? And the second is a request for guidance to solving this is possible.

Cheers,

JD