The following steps will help you setup your VPN in Windows 8.
Hover over the bottom right corner and drag the mouse up until the sidebar comes up. Click on Settings.
Click the Security tab
Change the following settings:
Type of VPN: Layer 2 Tunneling Protocol with IPsec (L2TP/IPSec)
Allow these Protocols: Radio button selected
Challenge Handshake Authentication Protocol (CHAP): Checked
Microsoft CHAP Version 2 (MS-CHAP v2): Checked
Click Start this Connection
Enter username and password and click OK
Your VPN will then connect
You have successfully setup your VPN on Windows 8