The information in this article applies to:
Microsoft Windows XP Home Edition
Microsoft Windows XP Professional
SYMPTOMS
When a registry hive becomes damaged, your computer may become unbootable, and you may receive one of the following Stop error messages on a blue screen:

Unexpected Shutdown
Stop:0xc0000135

CAUSE
Registry damage often occurs when programs with access to the registry do not cleanly remove temporary items that they store in the registry. This problem may also be caused if a program is terminated or experiences a user-mode fault.

RESOLUTION
NOTE : The hotfix that is described in this article automatically repairs the registry during startup, but does not display any notification of this process. If you import a damaged registry hive, you may receive a notification, and the recovery of the registry hive takes place as it imports.

A supported fix is now available from Microsoft, but it is only intended to correct the problem described in this article and should be applied only to systems experiencing this specific problem. This fix may receive additional testing at a later time, to further ensure product quality. Therefore, if you are not severely affected by this problem, Microsoft recommends that you wait for the next service pack that contains this fix.

VIEW THE MS ERROR INFORMATION

Enjoy,
BB

source: neowin.net