CleanURL issues even after disabling it
You can force clean urls to be Off with the following line in your settings.php file. Add the following to the end -- this settings overrides even whatever is in your database; be sure to remove it later.

/* Turn off clean urls */
$conf['clean_url'] = 0;


Whether or not your webserver supports Clean Urls depends on its' configuration. I recommend reviewing the Getting Started with Clean URLs Guide.