I am experiencing a slow internet connection using my new desktop (Specs: i7 2600 Intel core , ram 8GB, 1TB Hardrive

In comparison to my currently overall much faster laptop (2.10ghz) Internet speeds using BBC connection speed test being as follows:

Laptop (built in wi-if)- 8334 kbps - when both desktop and laptop on and using internet Laptop (built in wi-fi)- 8374 kbps - when desktop off and only laptop connected to internet

Desktop - -448 kbps - when laptop on and using internet Desktop - 438 kbps - when laptop off and only desktop using internet

As an example it took me two hours on my desktop to download 221MB and with other downloads it was still as slow

I am using a TEXET wireless 802.11b/g/n USB adapter with advertised connection speed of 150 mbps and I use a BT wireless hub

I don't think it could be the hub as the desktop runs slow whether in competition with my laptop for internet connection or not
Also if it was the hub why would it always give such a fastest rate to the laptop when both are on.?

According to the Realtek 11n USB software which came with TEXET wireless adapter it shows signal strength 67% and link quality 99% - I would expect a faster connection if these are correct.

Anyone have any ideas how I might go about fixing this issue?

Thanks