Use Freware: WakeupOnStandBy, SmartPower
Prop: Auto Power on & Shut down
Windows Task Scheduler:
How to Change the Return to Sleep Timeout for a Unattended Wake Up in Vista
How to Troubleshoot a Vista or Windows 7 Sleep Mode Problem
How to Create a Task to Wake up the Computer to Run in Vista and Windows 7
How to Disable or Enable Password Protection on Wake Up in Vista
WOL, Wake on Line: