If you are using the Windows PPTP (Point To Point Tunnel Protocol) VPN, then all traffic will be routed through the VPN server. The server may have been misconfigured now so it does not route correctly.
You can do the following and post the outputs here:
1. See the routing table on your PC. In a Windows command window, type: netstat -nr
2. Trace your traffic. Again in the above command window, type: tracert -d www.google.com. You will see where the traffic stops at.
