Slow Internet and troubles loading

Question

Hi guys and girls I was looking for a bit of help with my Internet connection.
I have Bt Infinity and everything was fine until around about the end of November. Now it is so slow in loading most (but not all) websites. It starts to load websites then it just stops, and I have to cancel it then reload it a few times to get it to load.
When I try to download files it only downloads a little bit then it stops, the only way I can download things is to keep redownloading it over and over until it finally finally finishes.
When I try to watch videos on youtube it Instantly buffers a section of the video then just stops. When I change the video quality either up or down it bufffers the next section instantly.
The Internet works perfectly on the wifi tho. Everything loads first time and very fast on my ipod and xbox but not so on the PC. I ran the Bt speed check and it came back with a downlaod speed of 35.2 mbps and a connection speed of 38.7 mbps.
If it helps I'm using a Desktop PC, running windows 7, I have made sure that all the windows updates are installed, Checked for viruses, Removed temp files. I am using firefox, the lastest version. I tried running it without add ons, I also tried using IE and Google Chrome and still it is so slow and hardly loads anything.
I am using Bt Home Hub 3 as was supplied by BT.
Like I said the Internet was fine til about 1 month ago and loaded everything fast first time. I never had any problems before with buffering videos.
Any help would be very nice as it is starting to get very annoying now.
Cheers Kirk

Answer 1

this link has also been posted recently http://support.microsoft.com/kb/928233/en-us it shows up as a vista problem but seems in some cases to work on win 7 worth looking at
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