|Switch from a Static IP to a Dynamic one. |
Control Panel -> Network Connections -> Right Click your NIC -> Click Properties -> Scroll to TCP/IP protocal (IP V4) -> select the Properties Button -> Check the Automatic IP box and DNS box.
If you where already using a Dynamic IP then there is something on your network that is using a static IP.
I would use an IP scanner like ZeNMAP or IPSCAN to see what the other device is.