@Pelego96
Try these then:

https://support.steampowered.com/kb_article.php?ref=5848-YWRM-8664
http://gaming.stackexchange.com/questions/183755/my-mouse-doesnt-show-up-when-i-play-games
http://gaming.stackexchange.com/questions/51351/mouse-cursor-wont-display-in-full-screen-games
http://www.makeuseof.com/answers/mouse-invisible-play-games-full-screen-mode/

The id and password aren't necessary :)