Also, flushing your DNS might be helpful, atleast, it never hurts...
Windows Vista / 7 / 8...
1. Click Start 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
7. You will see the following confirmation:
Windows IP Configuration
Successfully flushed the DNS Resolver Cache.