dvr TREND and IE stopped working

[peacemaker 0]

Hi guys. Here is my problem. I have TREND dvr and had absolutely no problems wit that more than 3 years. But about 2 days ago something went wrong. I cant watch it on internet anymore. No idea why. IE (Internet Explorer) was the only browser I was able to make it work with my dvr and I had no problems for 3 years as I said. But suddenly it doesnt work anymore. I have tried 4 computers but no success. The most strange thing about that is this: I tried one laptop via wi-fi (but used external IP adress) to connect the dvr. No success. So I started IE as administrator and it worked. I can watch my dvr from home but only with this one notebook and only if I start IE as administrator. This doesnt work with any other computer I tried even I used the very same actions. I dont get it. I really dont get it. Can you give me some advices please? Thank you.