Very slow internet in Windows 8.1, frequent dropouts

My internet can be very slow on my Windows 8.1 PC. All my other devices on speedtest.net show about 35 Mbps, this PC occasionally gets there but will very quickly drop to under 5 Mbps, and every 20-30 minutes the internet will drop altogether for about 20 seconds. I also have a Ubuntu partition on this same PC, and with this same hardware it maintains 35 Mbps.


This behaviour happens with my default ethernet (via powerline) connection, and also a wifi usb adapter.


I have the very latest driver (Realtek PCI-E Ethernet Driver) from my motherboards website.


I also tried the Windows 7 driver from here. I've no idea if it's the correct driver, all I did was google "Realtek PCI-E Ethernet Driver" and it took me there. When I installed it my speed was up to 35 Mbps for a while, then later it slowed to a crawl again. But this also happens when I do a fresh install of the up-to-date driver from the MSI website.


Why is this happening? Is there anything I can do?

Windows 8.1 64 bit
AMD A8 5600k processor
MSI FM2-A55M-E33 motherboard
8gb ram

Without a posted Speedtest or Shaper Probe result, we are going to be running blind here. It also helps to know who your ISP is, and what mfg & model of Gateway or Router you are using.

Ah sorry, will get to work on the speedtest/shaper probe result.

My ISP is BT (in the UK) and my router is the BT Home Hub 5.

Unfortunately (fortunately?) my speeds are perfect right now, probably because I just uninstalled and reinstalled my drivers today. I'll just have to wait for the slowdown to happen

See http://www.eightforums.com/network-sharing/55107-network-issues-bt-homehub-v3-up-down-dns.html The OP is also a BT customer. From history with working with BT customers on forums. This seems to be a common issue. Usually doing the fix as pointed in the link I posted, can usually resolve connection issues.

It is common for European and Asian ISP's to throttle or slow down customers. But also common for faulty equipment to be the culprit.