Gooday,, I am running windows 8.1 on my laptop with free AVG, but have inherited a virus called DNS Unlocked and cannot get rid of it, it won't let me run programs to remove it. Helpfull advice needed. Thanks
DNS Unlocker may have changed your default DNS settings. You can follow the steps in (http://guides.uufix.com/several-steps-to-remove-dns-unlocker-from-your-computer-effectively/) to repair it by yourself. (Take Windows 7 for example)
Click Start button, go to Control Panel and click the View network status and tasks link under Network and Internet category. (Note: The control panel screen is under View by: Category)
Then click on Local Area Connection.
In the pop-up Local Area Connection 2 Status window, you click on Properties button.
Click on Internet Protocol Version 4(TCP/IPv4) then click Properties button.
Select the Obtain DNS server address automatically option and click on OK button.
If the ads still occur, boot your PC in safe mode and run anti-malware software like Malwarebytes to scan for malware.