I found the error, not really, but I localized it. After deleting and make a fresh install (thank god, I have it in dvd), I always had the problem. So I took a look at the ini files and saw they were unchanged since I installed STEP. So I deleted them. Guess what, no problem anymore... I have deleting all for nothing... But I know I have to be careful with ini files now \o/
I have just finish install STEP 2.1 and when I test it, it seems I have missing textures. I don't think it's vram because it does even during loading screen and in the inventory. I don't know what to do except reinstall everything (which will be very very long :( ). Here is some screenshots I take :
In the cornered rat :
https://www.freeimagehosting.net/rwr9s
https://www.freeimagehosting.net/2dqnl
in dovakiin hideout :
https://www.freeimagehosting.net/7aghr
in whiterun house :
https://www.freeimagehosting.net/cfmgn
What do you think about it ?
Thank you
PS : Sorry for my english.