Help with internet issues

[ceekaj]

So my internet has always been good. I have an ethernet connection and never have any problems with downloads or streaming or anything like that. However a month ago it changed out of nowehere and now I can't stream one youtube video without it buffering or download anything. I have run speed tests on my internet and ping and they always return very well. However, still for whatever reason my pc refuses to use the internet and actually perform how it should. I have reset windows, my router, browsers, everything. I still can't figure out why my pc isn't getting the internet it should. When I run the speed test it has no problems at all but immediately after that it goes back to not being able to download anything even though I literally just saw it the capabilities to do it. Help would be very much appreciated and I will try to respond to all comments as quickly as possible.