The prompt for user password upon ake up or resume from sleep is a feature provided in Vista (Also in XP) for security reason.  But if you are the sole owner of PC and you do not have any threat from some one gaining access to your PC then you might find this feature an annoying one and may want to disable  it.  You can follow these few simple steps to disable this feature:

1. Log on to your computer as an administrator. Click on Start, go to Control Panel -> System and Maintenance -> Power Options.
2. Click on Change plan settings for the currently active plan.
3. Click on Change advanced power settings link.

Enable Not Available Advanced Settings in Power Options

4. Click on Change settings that are not currently available link. Give permission to continue when User Account Control dialog pops up.
5. In the “Power Options” dialog box’s “Advanced Settings” tab for the active power plan, expand Additional settings.
6. Expand Request a password on wakeup.
7. Change the value to No for “Request a password on wakeup” by selecting a new option from drop down menu for both On battery and Plugged in.

8. Click OK button.

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