Did you just change the motherboard and not do a clean install?
Usually changing motherboard while keeping an old install of Windows can cause a lot of driver conflicts due to older drivers from the older motherboard.
Have you tried installing the latest network drivers and see if that helps?
		
		
	 
yeah i did a clean install as i moved my OS onto an SSD at the same time.
	
		
	
	
		
		
			You're getting massive latency with that pingtest. I would expect ~15-40ms to bbc on a fibre connection, you're getting 585ms.
Try a tracert google.co.uk which will show you the different hops to the server including the first to your router. It should be ~3ms using homeplugs. I'd hazard a guess thats where your problem is..
Can you try connecting a longer patch cable straight to your router?
		
		
	 
before upgrading i was having no problems with the homeplugs which is strange, i have tried a patch cable straigh to my router and no different
Tracert using homeplugs
microsoft Windows [Version 6.1.7601]
Copyright (c) 2009 Microsoft Corporation.  All rights reserved.
C:\Users\Richard>tracert google.co.uk
Tracing route to google.co.uk [62.252.232.59]
over a maximum of 30 hops:
  1    19 ms    16 ms    26 ms  10.156.48.1
  2    38 ms    16 ms    17 ms  midd-core-2b-xe-1131-0.network.virginmedia.net [
62.252.68.41]
  3    24 ms    25 ms    62 ms  manc-bb-1d-ae22-0.network.virginmedia.net [62.25
3.174.49]
  4     *        *        *     Request timed out.
  5     *        *        *     Request timed out.
  6   201 ms    22 ms    19 ms  leed-bb-1b-ae0-0.network.virginmedia.net [62.254
.42.230]
  7    18 ms    24 ms    56 ms  leed-icdn-1-ae0-0.network.virginmedia.net [62.25
4.42.158]
  8    18 ms    23 ms    24 ms  cpc41-dudl11-2-0-cust58.16-1.cable.virginm.net [
62.252.232.59]
Trace complete.
Tracert with cable straight to modem
C:\Users\Richard>tracert google.co.uk
Tracing route to google.co.uk [62.252.232.55]
over a maximum of 30 hops:
  1    10 ms    11 ms    10 ms  10.156.48.1
  2   141 ms   133 ms    51 ms  midd-core-2b-xe-1131-0.network.virginmedia.net [
62.252.68.41]
  3   424 ms  1494 ms   194 ms  manc-bb-1d-ae22-0.network.virginmedia.net [62.25
3.174.49]
  4     *        *        *     Request timed out.
  5     *        *        *     Request timed out.
  6    39 ms    12 ms    25 ms  leed-bb-1b-ae0-0.network.virginmedia.net [62.254
.42.230]
  7     *        *        *     Request timed out.
  8    20 ms    19 ms    13 ms  cpc41-dudl11-2-0-cust54.16-1.cable.virginm.net [
62.252.232.55]
Trace complete.
C:\Users\Richard>
	
		
	
	
		
		
			Go into Internet Explorer and check in internet option that it is not set up to use a proxy.
		
		
	 
IE doesnt have a proxy on it atm