The pop-ups from dky.cachefr.net don't appear in your browser by themselves. Typically they're powered by the malicious activity of some other adware program which causes them to appear. In order to clean your PC from these nasty pop-up ads you're recommended to perform a thorough system cleanup of your computer.
First of all you should realize that dky.cachefr.net pop-up is the result of you installing some adware program. You might say that you've never done this, but remember that there are very many adware programs and other potentially unwanted utilities today which are actively distributed together with many other free applicaitions, which users like you regularly download online. So, this is important for all of us to know what exactly we're installing.
When dealing with free programs that can be potentially downloaded online users must be very careful not to install any extras, which are surely not necessary at all. Always make sure you read the instructions of the setup wizard carefully. This is how you will be able to avoid unwanted installation of adware progams and other infections, like the adware that causes dky.cachefr.net pop-ups to come up in your browser.
In order to get rid of annoying pop-ups from dky.cachefr.net in your default browser you need to complete a thorough system scan of your PC with the help of a reliable antivirus program. We recommend you to perform a full system scan with the help of GridinSoft Trojan Killer program as explained below.