1. Click Start, All Programs, and then right click on "Command Prompt".
2. From the context menu click on "Run as administrator".
3. If User Account Control prompts you to allow the action, click on Continue.
4. In the command prompt window, type "powercfg –h off" (without the quotes).
4. Close the Command Prompt window.
Delete the Hibernation File:
1. Click Start, All Programs, Accessories, System Tools, and then click "Disk Cleanup".
2. If prompted to choose a drive, select the drive in which Windows Vista is installed on to and press OK.
3. Disk Cleanup will scan the hard drive and present you with a list of options.
4. Check "Hibernation File Cleaner", and then click OK.
5. When asked "Are you sure you want to permanently delete these files?" click on the Delete Files button.