The Microsoft Windows family of operating systems displays an 8-digital hexadecimal code when it encounters a non-recoverable critical error which causes the operating system to crash. There are various reasons for encountering such errors which may range from file system corruption, sudden power outage, operating system malfunction, virus attack, to many more. Generally, after encountering Stop errors the Windows based computers become unresponsive or unbootable and thus all the data stored in them becomes inaccessible. However, in such cases of data loss, you can always use backup.
Let us exemplify the above situation. While working on Windows based computer, you suddenly encounter a power outage and your system shuts down abruptly. However, after this mishap when you started your system encountered the below mentioned Stop error message:
“STOP: 0x0000006F (0xC0000034, 0x00000000, 0x00000000, 0x00000000) 
Session3_Initialization_Failed”
The four parameters differ with system’s configuration.
After getting this error message, your system becomes unbootable. To fix this error, you must first understand the cause behind the issue.
Cause:
When a file (such as Smss.exe) critical to system initialization is missing or corrupt then you encounter this error message.
Resolution:
To fix this issue, you must restore the missing or corrupt file. Thus, to do the same, use the following methods:
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If you have installed Windows operating system on FAT (File Allocation Table) partition then copy the initialization file to the %SystemRoot%System32 directory.
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If your Windows OS is installed on NTFS (New Technology File System) partition then reinstall Windows to separate directory. Then Log On as the same user which is having the same permission and then copy the initialization file to %SystemRoot%System32 directory.
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However, if you have installed Windows 2000 on NTFS partition then use the Recovery Console to replace the system files.
However, if you encounter the same error message even after taking the above mentioned measures then you need to reinstall Windows operating system. Since a fresh new reinstallation of Windows operating system deletes all the data stored which can’t be recovered easily. For the same, it is advisable to chose any well known data recovery software that is effective and can recover the formatted data. Thus, for complete and systematically repair Windows you need to follow the above mentioned steps carefully.