Well mates, I've good news.
After a full format and a full new OS instal, my SH3 run now perfectly.
and I must tell you that it's a enormous pleasure but also an amazing crazy affair.
In fact, I suspected a RAM problem thought it was new(1 year).
I removed the 2 GRAM and reinstal the original 1 GRAM before format.
And although 1 GRAM less, inside the game I have 75 fps in the coning tower by bad weather !
No bug, no crash, everything is absolutly perfect.
But the most incredible is the way I proceeded to find my current campaign.
I have not done a new installation, but recovered a full backup !
However, I had the files for my campagn(Jochen Mohr campaign) trying to save the file Ubisoft / SilentHunterIII failed. So I picked a backup this file from October 2010 and I installed with campaign files dating from January 2011 !
And it works as never !
Amazing.
Thanks a lot to your help.
Now, if a same problem appears, one solution: c:/format !
PS: I've tried to a 2007 full backup, SH3+GWX 1.3 and it run also perfectly.