I assume this problem started when you updated to Windows 10? I see you already updated to the latest version of RealPlayer and Adobe Flash, since those 2 things would be on my list of possible fixes.
Try updating to the latest Intel HD graphic drivers for your Dell 15R laptop. The exact graphics card model you have is the Intel HD 4400. Here is a link from the Intel site with the latest graphic drivers, which were released less than a week ago.
There are 2 links. Download the first one, closer to the top of the page. Once you download it, go to your download folder on your computer and start up the file. After the graphics card is updated, restart your computer so it could take full effect.
Tip For Anyone Needing to Update Drivers: Only download and install drivers from legit sites. Just a few examples of trusted sites are the ones from Intel, Dell, HP, nVidia, AMD, Razor, Logitech, Microsoft, Apple and VIA. Never go to smaller sites you are not familiar with to download drivers, they may contain viruses.