Keep Wifi Connection When Close Laptop Lid

System: Window 7 (64-bit)

1. Control Panel > All Control Panel Items > Power Options > Edit Plan Settings(Choose when to turn off the display)
   change the 'Put the computer to sleep' setting to a longer time or Never.
2. Control Panel > All Control Panel Items > Network and Sharing Center > (Change adapter settings)
   2.1 right click on 'Wireless Network Connection' then 'Properties'
   2.2 Configure...
   2.3 switch to 'Power Management' page, uncheck 'Allow the computer to turn off this device to save power' option, OK
   

User Account Control(UAC) in Vista

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What’s User Account Control (UAC) in Windows Vista?

Disable User Account Control in Windows Vista.