Can't play! crashing on startup! UNITY crash. i can play only at sleepers servers

Like the title saying.
UNITY CRASHED CAUSE A FATAL ERROR
i have no idea why!
my unity is always crashing on startup.
here for proof my comp not bad (for those who saying my comp is bad)
OS:windows 7 64bit
Nvidia GTX 660 TI
INTELCORE I5
8 ram

[editline]20th October 2013[/editline]

Fix i cannot play on sleepers server too! it was only 1 time and its crash in 5 minutes