Great speeds wired, poor wireless..

Good morning.
 I had BT infinity installed earlier this week, absolutely delighted thus far with download speeds nearing 80mb via ethernet connection. However whenever I try using the wifi connection I'm only managing speeds ranging from 4mbs-20mbs.
 I have read numerous posts regarding the adaptor needs upgrading/updating. I honestly have no idea about this and need abit of help in what I need to buy/do in order to achieve greater speeds wireless.
I have read something about a "N" adaptor. Is this like a usb stick which plugs into the laptop or do you need to take the whole laptop apart and remove the original adaptor? Where can I pick up one of these adaptors and finally how do I find my current adaptor type?
 Sorry for all the questions, i'm absolutely usless with computers.
 Thanks for your time
James

Its not usually practical to change the internal wireless card in your laptop, as there can be incompatibility issues, as it depends on the laptops motherboard manufacturer. There is also a chance of damaging the laptop.
An external USB adapter simply plugs int a spare USB port on the laptop, and you then select that adapter instead of the laptops internal one.
Here is the TP-Link TL-WN722N as an example.
There is also a very tiny Edimax EW-7811Un one, which I use myself, and looks like this
When it is plugged into a USB port, you hardly notice it.
There are some useful help pages here, for BT Broadband customers only, on my personal website.
BT Broadband customers - help with broadband, WiFi, networking, e-mail and phones.

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