A Windows 7 based computer can become unbootable for several number of factors. One of the typical results of such problems is Blue Screen Of Deaths (BSODs) at startup, which generally render your data inaccessible. In such cases, the data backup availability is essential or otherwise, it can leave you in unavoidable situations of using a Windows Data Recovery utility.

For instance, consider you try to start a Windows 7 based computer system. At this point, the system might fail to respond and prompt an error message as below:

“STATUS_SYSTEM_PROCESS_TERMINATED”

Or

“STOP: 0xC000021A”

The error might prevent you to let access the data stored on the hard drive.

Cause

The mentioned stop error occurs when a subsystem (such as Winlogon etc.) of user-mode in Windows 7 has been compromised. Windows 7 cannot guarantee the security. The error typically occurs when Windows 7 switches into kernel mode. The system cannot run without the aid of these services. This can occur because of some third-party tool.

One another possibility of this error to occur is that the system administrator has modified the permissions to access system files and folders and these files are no longer accessible.

Solution

You cannot use kernel debugger in this case because these issues occur in a user-mode process. To solve it, you should try these suggestions:

If you have updated any device driver, perform a driver rollback. Start the computer in safe mode and perform a 'System Restore' through command prompt

If you are unable to boot the computer, boot it using Windows installation disc and restore it to the last working state using 'Last Known Good Configuration' option. If none of the above solutions work, reinstall Windows 7 provided a good backup is present.

In case you cannot access the data and data backup is not present, you are suggested to opt for a Windows Partition Recovery utility. These are suitable Windows Data Recovery applications built for scanning the logically crashed drive and recover the lost data safely. The software are easy to install and use.

Stellar Phoenix Windows Data Recovery is a fully-featured utility to recover lost data from Windows 7, Vista, XP, 2003 and 2000 based systems. It is compatible with FAT32, VFAT, NTFS and NTFS5 file system drives. This Windows Partition Recovery utility uses high-end scanning algorithms and provides advanced set of file recovery features.