Hi everyone,
i have posted my problem in the absolute beginner section before (here).Now i think it's time to post my issue in a more specific forum section.

As you can see from my last post,part of my problem has been resolved (thanks to N.N.),but it seems i'm continuing to have issues...
I can see all the desktop and panel icons,i can click them,but when i do that the system hungs,until it informs me that the window browser is not responding and i have to "force quit" it...
After that,i'm not able to do anything (even to log out properly).

As suggested by N.N. i created a new user:using this new user,things work properly.So i could use this new user,but i would like to know how to fix my original user's environment...

Can you please help?