The Stop 0x7B message indicates that Windows XP Professional has lost access to the system partition or boot volume during the startup process.
Solution :
-
Run any system diagnostics that are supplied by your computer manufacturer, especially a HDD check. -
Rebuild the Boot.ini file. -
Run chkdsk /r or chkdsk /f to detect and resolve any file system structural damage. -
If all Hardware fully functional reinstall Operating System.