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If you thought you were safe and bug free after downloading Windows Vista Sp1, you’d better think otherwise. As a matter of fact a lot of users are reporting scattered issues on their computers due to Windows Vista Service Pack. One of the most irritating one is the computer being unable to go into hibernation mode. For a change it will give you back a blue screen of death (BSoD) or it will just shutdown without any error message. This issue may be due to corrupted or invalid Boot Configuration Data (BCD) store file. To fix it, simply follow this trick:

1. Run Cmd.exe as Administrator.

2. Run the following command: bcdedit -enum all

   Look for “Resume from Hibernate” in the output from the command above(example below):

   Resume from Hibernate

   ———————

   identifier {3d8d3081-33ac-11dc-9a41-806e6f6e6963}

   device partition=C:

   path \Windows\system32\winresume.exe

   description Windows Vista (TM) Enterprise (recovered)

   inherit {resumeloadersettings}

   filedevice partition=C:

   filepath \hiberfil.sys

   pae Yes

   debugoptionenabled No.

3. Once you have found it, copy the value for identifier (in this example - {3d8d3081-33ac-11dc-9a41-806e6f6e6963})
4. Run the following command: bcdedit /deletevalue {3d8d3081-33ac-11dc-9a41-806e6f6e6963} inherit.
5. Test hibernation.

Source: forums.microsoft.com