whenever i press some certain buttons in the game like press on the items or on the skills or something my comp freezes up and it restarts.
it only freezes up wen i use the left mouse but not when i use the left mouse.
can someone please tell me how to fix this, because its restricting me to do many things in the game that i want to do.

If what you say is actually happening only when you play fiesta i suggest you post your problem in the Fiesta boards. theres nothing any of us can do here.

whatever i alreayd un-installed that shit

Mind still posting your problem at the fiesta boards? That way the could research the problem and fix it so it wont happen to anyone again.

Make sure your computer meets all the system requirements, and check your graphics card. This happened in another game I play, it would just freeze and I would have to restart my computer. I got a new card, and that fixed the problem. Try cleaning yours out a bit, it may help.