An error occurred while releasing interface Loopback Pseudo-Interface 1 : The system cannot find the file specified.

Hello Nimnose,

Welcome to Microsoft Answers forum!

Are you trying run the commands in the Elevated command prompt?

Open an elevated command prompt. Run:

To open an elevated command prompt, click start and type CMD. Right click  the entry that appears in the menu and choose 'run as administrator'. Click continues at the UAC dialog. You must use this mode for these commands to work properly.

 ipconfig /release
 ipconfig /flushdns
 ipconfig /renew

If this does not work, Method 1: Turn Off Firewalls

Make sure there are no firewalls and that Windows Vista Internet Firewall or Windows Firewall is turned off.

Method 2: Update or reinstall the driver.

Here are the steps to reinstall the network adapter:

1.   Launch Device Manager.

2.   In Device Manager's left panel, open the node that represents the type of device that you want to uninstall and then right-click the device entry.

3.   On the shortcut menu, click Uninstall.

4.   On the Confirm Device Removal dialog box, click OK to start the uninstall process.

Method 3: Verify That the Dynamic Host Configuration Protocol (DHCP) Client Service Is Started

Verify that the DHCP Client service is started. To do so, follow these steps:

Click on Start and enter services.msc.

In the services, look for the DHCP Client service.

Verify that the DHCP Client service is running.

If the service is stopped, right-click DHCP Client, and then click Start.

Note if the service does not start, a dependency group or service may also be stopped.

Method 4: At the command prompt, type netsh int ip reset resetlog.txt, and then press ENTER to reset the TCP/IP network protocol.

Try these steps and let us know if it works.

Thanks,
Irfan H, Microsoft Answers Support Engineer. Visit our Microsoft Answers Feedback Forum and let us know what you think.