Make sure you have your network adapter's TCP/IP v4. settings configured for automatic for IP address and DNS. You'll find the settings under properties for each respective network adapter. Here are the instructions for Windows 7. http://windows.microsoft.com/en-us/windows7/change-tcp-ip-settings
Another common network problem with laptops is frequent sleep mode.
Here's how it works:
Every device that has a network interface has a unique MAC (Media Access Control) address. This is usually expressed in hexadecimal such as 10:25:A4:59:EF:1C
When your router sees a device's unique MAC address on your LAN or WLAN, it then assigns it an unique IP address from it's available range using a process called DHCP.
Dynamic Host Configuration Protocol (DHCP) is an auto configuration protocol used on IP networks. DHCP allows a computer to be configured automatically, eliminating the need for intervention by a network administrator. It also provides a central database for keeping track of computers that have been connected to the network. This prevents two computers from accidentally being configured with the same IP address. http://en.wikipedia.org/wiki/Dynamic_Host_Configuration_Protocol
IP addresses are usually automatically assigned by the DHCP service running on your router, but can be set manually. They are in binary but usually expressed in readable format such as 192.168.1.1
If you put your computer in sleep mode, the router will release the IP address back into the pool. When the router sees another device on your network it can assign it this IP address.
When you bring your computer out of sleep mode it will still have the old IP address which the router has subsequently assigned to another device. Thus, you get a IP conflict.
You could reboot the computer or restart the router, either will resolve the conflict.
You can set up static LAN IP addresses on all of your devices, however there is a easier way.
Many people would be likely be surprised at how many active connections their wireless router has. I have dozens. cell phones, tablets, iPods, game consoles, laptops, desktops, ROKU boxes, Internet enabled devices such as TVs and audio receivers, and the list goes on.
Most routers will let you reserve IP addresses for specific computers and other devices by specifying the unique MAC address of the device. Then every time the router sees this specific device on the network it gives it the same address. This IP address is reserved for the device with a specific MAC address and it won't be assigned to another device on your network. You could use this to eliminate IP address conflicts from happening in the future.
When you go to this feature on your router it will show the MAC address and current DHCP assigned IP address of each connected device making it easy to set up.
Good Luck...