To reinstall power management in windows Vista operating system: 1) Click on start and type device manager in search field. 2) Click on device manager in the list. 3) Click + next to system devices. 4) Right click on folowing controllers and select un install one by one. Uninstall only the options that are available in the notebook from the following options. a) ACPI Fan b) ACPI Fixed feature button c) ACPI Thermal Zone d) ACPI compliant system Restart your notebook after uninstalling all above controllers from device manager. Operating system will install new drivers automatically on restarting notebook.Then need to install the latest BIOS for your notebook model to get rid of the issue.
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