Oh, I am sorry, the error is 0xC2 not 0xCF . BSOD is Blue Screen Of Death. Gael043 After the installation, system reboot and then activate the parameter of the first account available (My account). I have been able to boot in safe mode, the problem is probably a driver. With the search I made on the Microsoft database, the faulty driver is Win32k.sys. I don't know what it do exacly but I will disable it and try again. The error has been reported only on Printer server but I think the error is the same because the description of the error code and the problem described in the Microsoft Database is the same. I can't find any link explaining correctly the error but it is called BAD_POOL_CALLER. I am trying to find a way to copy the dump error code . I tried to run SFC checker (cmd > "sfc /scannow" and "sfc /scanonce") but it say that the RPC server is unavailable. I have been able to get the Code description from my ipod touch 4G with an applicaiton called "BSOD". Unfortunatly, the source has been deleted, so the only way to get the information is from my ipod. I will continue to find the missing update and correct this problem. Have a good day! gael043