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Check for network adaptor problems using Device Manager  
  1. Right-click the My Computer icon on the desktop.
  2. Select Properties from the menu. The System Properties window appears.
  3. If you're using Windows Vista, simply click Device Manager. If you're using an earlier version of Windows, select the Hardware tab and then Device Manager.
  4. When Device Manager displays, expand Network Adapters by clicking on the plus (+) sign. Problems with the network adaptor (or other hardware devices) are indicated with a yellow exclamation mark.

  5. Figure depicting Windows XP Device Manager

  6. Close the Device Manager window.

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