Hi,
First I apologize for my “frenchy” english…
Everytime i try to launch Unity4 (last version) he crashes…since a couple of days(it worked before)

Here is the complete log (sorry some parts are in french but i hope you could understand as well)
Event probelm name: APPCRASH
Application name: Unity.exe
Apllication version: 4.1.2.1635
Horodatage de l’application: 514e9948
default module name: ntdll.dll
default module version: 6.1.7601.17725
Horodateur du module par défaut: 4ec49b8f
Code de l’exception: c00000fd
Décalage de l’exception: 000222a2
Version du système: 6.1.7601.2.1.0.768.3
Identificateur de paramètres régionaux: 1036
Information supplémentaire n°1: e8ad
Information supplémentaire n°2: e8adce1c2b9e7be834b4063ac3c53863
Information supplémentaire n°3: e8ad
Information supplémentaire n°4: e8adce1c2b9e7be834b4063ac3c53863
I tried everything i could to solve this error:
Windows driver and hardware have been updated
I repaired system many times…(chkdsk, CCleaner, sfc /scannow)
I try to replace the ntdll.dll file with a new one but unfortunatly i couldn’t change his name by “ntdll.old” .a error message pops up telling" trustedInstaller needs an authorization to edit this file" even in safe mod…
Of course i reinstalled Unity at least 10 time…
My last option is to reinstall windows but i would prefer not doing it…
SOmetimes the error message coming from Unity change as you can see here :

It concerns mono.dll …
So i really will appreciate if someone could help me to solve this issue…
thanks a lot ,
OhKerod