To sniff out if it's hardware I boot up any of the Live OSes out there. But given only this much detail, well, any guess is likely wrong except for reloading the OS.
Bob
Hey guys.
I'm currently running a Powerline Adapter connection from my router to my PC and I'm getting huge ping from it. These are the adapters: http://www.amazon.co.uk/TP-Link-TL-PA451KIT-Powerline-Adapter-Through/dp/B00D8BGLMY/ref=sr_1_5?ie=UTF8&qid=1420133078&sr=8-5&keywords=tp+link+500+powerline
Here is my speedtest.net
http://i.imgur.com/UhNM3x2.png
result. As you can see, 514ms is absolutely huge. I was sure it was my powerline adapters. I did everything under the sun with them (switching sockets, cable, etc etc) but it turns out that it's actually my PC. I should also add that at least once or twice a day my connection will drop completely for about a solid minute, windows "repair connection" finds nothing wrong. Something seems to be up with my PC.
A while ago I plugged my laptop in directly to my adapter instead of my PC and I got 14ms.
Anyone have any idea what could be causing this?
I did the following and it didn't change anything.
netsh winsock reset catalog
netsh int ipv4 reset reset.log
netsh int ipv6 reset reset.log

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic