Try doing the following:
Remove basic cookies and tracking files from your computer on a regular basis.
Go to Internet options or settings in your web browser and select "Delete Browsing History"; or "Cleanup or Clear Private Data." Select "Cookies" and "temporary Internet files" as items to delete and select "Delete" or "OK."
This will remove cookies left behind by tracking programs and ad programs and prevent the pop-ups from reappearing anytime soon.
You should do this weekly for best results.
Some cookies are good and help sites remember user information.
Deleting cookies means you may have to reenter user names and other pre-filled information in online forms when visiting sites that you visit regularly.
Locate XXX program files on your computer.
XXX went beyond standard cookie files and installed files on the user`s computer.
Go to "Control Panel" and select "Add/Remove Programs."
Look for files or programs named "DNS Unlocker" and select "Remove."
You may have to restart your computer. Type "DNS Unlocker" into the search box on your computer, found in the "Start" menu for Windows users.
Review the results that come up and delete files that relate to the this pop-ups.
If you are unsure if a file relates to the pop-up software, consult a computer technician or leave the file alone.
Run your antivirus software or ad blocking software if you have either installed.
This can help remove malicious files that may have been overlooked and can also help remove other pop-up and spam-like software.
Antivirus software run on a regular basis can help protect your computer from viruses, spam and other online threats besides pop-up ads.
Restart your computer when you are prompted to do so or when you finish each of these steps.