Heya everybody, sorry for being more absent than i'm already am these past few days but i have great news :
My PC is finaly fixed !... Yaaay !!! :D

So, because the hard disk was the cause of the problem, i had to change it aaand... well, that means i have to reinstall all of my stuff again, etc... Good thing i have a backup so i didn't loose importants datas but the principal is that now i can watch videos on the internet while drawing again without having to borrow someone else's pc ! ^_^