Try flushing the DNS:
(1) Open the command prompt. The command to flush DNS needs to be entered in the command prompt. Accessing the command prompt is slightly different depending on which version of Windows you are running: •Windows 8 – Press the Windows key + X and select “Command Prompt (Administrator)”.
•Windows 7/Vista – Click the Start menu and enter “cmd” into the Search field. Right click on Command Prompt and select “Run As Administrator”.
•Windows XP – Click on the Start menu and then click Run. Enter “cmd” into the Run field and press Enter.
(2) Use the DNS flush command. Type ipconfig /flushdns and press Enter. A message will appear stating “Windows IP configuration successfully flushed the DNS Resolver Cache”.
(3) Exit the command prompt. Type exit and press Enter. This will close the command prompt.