Certain Sites Not Loading Or Not Loading Properly

One particular site that is not loading at all, on any browsers on my computer is [URL]. There are many more that fail to load as well. I did test these sites on my iPhone with no problems though. There are a handful of other sites that do open but do not load properly [missing images, ect.] I also thought that it might be malware but I installed & scanned my computer with four different programs which did not solve the problem. I'm guessing that it still may be some problem on the software side with settings but I can't seem to figure out where to look. BTW, I've been using Microsoft Security Essentials as my antivirus program for the past couple of days now. Prior to that I was using Avira but it seemed to be giving me problems so I uninstalled it and installed the Microsoft app.