Just came across this Popup while trying to download something through A popular downloading website. (No Names Mentioned).
First they try and make you believe that you have some sort of viruses and infections on your computer:
Then they try and diagnose your computer with a fake scan in-order to try and make you believe that there is something wrong.:
Then they try and make you download there TOOL which is probably filled with rats and viruses in order to steal and obtain private information on your computer:
If anyone would like to make a video of this, testing the program out on a virtual machine, please feel free to do so, I am very curious as to what will happen.
The Link to this popup is : http://security.microsoft.com.ultnr.keensilentbuffaloofagility.review/ow/en/index.html
You can open this in a normal browser, it doesn't try to download anything automatically.
Thanks, OGCactus :).