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After you run the Disk Cleanup wizard in Windows Vista Enterprise, you cannot put the computer into hibernation.
This problem occurs if you select the Hibernation File Cleaner check box when you run the Disk Cleanup wizard. Hibernation File Cleaner removes the hibernation file and turns off hibernation.
To resolve this problem, re-enable hibernation. To do this, follow these steps:
Click Start, click All Programs, and then click Accessories.
Right-click Command Prompt, and then click Run as administrator.
If you are prompted for an administrator password or for a confirmation, type the password, or click Allow.
At the prompt in the Administrator: Command Prompt window, type powercfg -h.