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To resolve this problem in Windows Vista, run the powercfg -h on command at a command prompt to enable the hibernate feature and the hybrid sleep feature. To run this command, follow these steps:
1. Click Start, click All Programs, and then click Accessories.
2. Right-click Command Prompt, and then click Run as administrator. If you are prompted for an administrator password or for confirmation, type the password, or click Continue.
3. Type powercfg -h on, and then press ENTER.