Follow these steps for flushing DNS cache: For XP/VISTA

  1. Click the Microsoft Vista Start logo in the bottom left corner of the screen 2. Click All Programs 3. Click Accessories 4. RIGHT-click on Command Prompt 5. Select Run As Administrator 6. In the command window type the following and then hit enter: ipconfig /flushdns

1.Press Windows Key+R  2.Type CMD 3.In the command window type the following and then hit enter: ipconfig /flushdns 4. You will see the following confirmation: DNS Cache Flush Clear or Reset in Vista Windows 7 and Windows 8 - 22DNS Cache Flush Clear or Reset in Vista Windows 7 and Windows 8 - 34DNS Cache Flush Clear or Reset in Vista Windows 7 and Windows 8 - 33