general problem with CI getting work :(

[eluser]lemonek[/eluser]
[quote author="garycocs" date="1251686622"]What I did first was to modify the Welcome controller, give that a go first and see how you get on??[/quote]

I dont know what you exacly mean but if i put:
<?php

class Welcome extends Controller {

function Welcome()
{
parent::Controller();
}

function index()
{
echo 'hello';
}
}

into welcome.php when i entering localhost/ci/ i gets hello

but when i entering http://localhost/ci/welcome/ i gets:
The URI you submitted has disallowed characters.