I have error_name_not_resolved problem in my pc.

I have error_name_not_resolved problem in my pc.
I do this, but now my computer does not even start
This problem may occur if the DNS settings are incorrect.
Verify that DNS is configured automatically.
Method 1: See if setting a static IP address for the LAN adapter helps. To do this, use 208.67.222.222 for the DNS server.
Here is how:
A) Click Start, type ncpa.cpl, and then press Enter.
B) Right-click the connection that you want to use for the local connection, and then click Properties.
C) Click Internet Protocol Version 4 (TCP / IPv4), and then click Properties.
D) In the Internet Protocol window, change the preferred DNS server to 208.67.222.222
E) In the Properties (TCP / IPv4), select the Verify settings on exit check box.
F) Click OK twice to complete the change.
G) Repeat the steps, and set the preferred DNS server to 208.67.220.220 if the above fails.
Method 2: Follow these steps:
Step 1: Delete the DNS cache and check how it works.
To delete DNS, perform the following steps.
on. Click Start.
B. Click All Programs, then click Accessories
C. Right-click the command-input option,
D. From the drop-down menu that appears, click Run as administrator.
That is, type ipconfig / flushdns in the prompt and press Enter.
Step 2: You can also try to reset and check the TCP / IP on the system:.
Reset Internet Protocol (TCP / IP)
If that does not help, try to reset the modem.
To do this, follow these steps:
on. Disconnect the cable that connects the computer to the modem.
B. Turn off the modem and the router.
Note: If the modem or router does not have a power switch, disconnect the power to the modem or router.
D. Reboot the computer.
Ie, after restarting the computer, turn on the modem or router, connect the cable from the computer to the modem or router, and then restart the computer.
F. Make sure all network cables are connected properly.
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