If you are seeing random pop-up ads from Downasd.com
 within Internet Explorer, Firefox and Google Chrome, then your computer
 is infected with an adware or a potentially unwanted program.

The Downasd.com pop-up ad happens regardless of the web browser or 
search engine, and if you are seeing ads from Downasd.com whenever you 
are doing a Google search or clicking on a link, then your computer may 
be infected with adware or a potentially unwanted program. This 
infection is designed specifically to make money. It generates web 
traffic, collects sales leads for other dubious sites, and will display 
advertisements and sponsored links within your web browser.
The Downasd.com advertisments are caused by an ad-supported (users 
may see additional banner, search, pop-up, pop-under, interstitial and 
in-text link advertisements) cross web browser plugin for Internet 
Explorer, Firefox and Chrome, which is distributed through various 
monetization platforms during installation. The malicious browser 
extensions is typically added when you install another free software 
(video recording/streaming, download-managers or PDF creators) that had 
bundled into their installation this adware program.
When an adware extension is installed on your computer, whenever you 
will open a new tab within Internet Explorer, Firefox and Google Chrome,
 an ad from Downasd.com will pop-up. This infection will also display 
advertising banners on the web pages that you are visiting, and as you 
browse Internet, it will show coupons and other deals available on 
different websites.
Downasd.com is not a malicious domain itself, however cyber criminals
 are using an adware program to display ads from this domain, thus 
getting pay-per-click revenue.
You should 
always pay attention when installing software
 because often, a software installer includes optional installs, such as
 this program that is causing the Downasd.com redirect. Be very careful 
what you agree to install.
Always opt for the custom installation and deselect 
anything that is not familiar, especially optional software that you 
never wanted to download and install in the first place. It goes without
 saying that you should not install software that you don’t trust.