Our component SET Translater, sef mean search engine friendly .
When you configure it as described in that component help page for Redirect mode. You was need configure htaccess file. That file and add for every your language - language prefix at site name likef "fr" - for France, "ru" for "Russian" ....
And next self component use that prefix for understand to what language you wish translate site. Also that prefix help for google - add new urls with hew languages to your site.
If you no need that - you need remove changes what you added in htaccess file, and turn off redirect mode in sef Translate module.
You may use only aJax mode