Wireless or LAN speed difference?

[#1]

Is there anything I can do to increase my BB speed, Wireless v LAN cable ?. 
Thomson router in use & in same room. Noise margin 6 - 8db, connection 8128 kbs.  Wireless d/loads 3.2Mbs & LAN cable 6Mps.  I would expect some fall off but not as great.  Is it the router or my laptop?
If anyone has time to comment from their experience, much appreciated please.

[#2]

HI exporters,
You can find some useful tips here about how to investigate wireless issues.
Jojo

[#3]

Check the MTU setting on your router. If it is smaller than the setting on your PC it will have a more dramatic impact on wireless than on LAN. I've never seen any evidence that indicates having the router larger than the PC has a detrimental affect, so the simplest thing to do is to put the router MTU up to the maximum allowed (1500) and see if that helps.
I had a friend whose wireless throughput nearly doubled when he did that.

[#4]

JoJo & Jelv - appreciated, many thanks. 
I've tried changing the MTU to 1500 [decimal], following the Microsoft - 'How to change the PPPoE MTU size in Windows XP' @ :-
http://support.microsoft.com/default.aspx?scid=kb;en-us;283165.
Doesn't seem to improve Wireless speed; just tried via Thinkbroadband & get -  Wireless 2.6Mbps/0.4Mbps & cable 6.0Mbps/0.4Mbps. 
Any other suggestions please or should I just settle for the cable dragged across the door!

[#5]

No, no, no!
It's the MTU setting on your router that is crucial, it MUST be equal or larger than the PC MTU.

[#6]

Quote from: exporters

Any other suggestions please or should I just settle for the cable dragged across the door!

As you are on XP, give Dr TCP a twirl - it looks like the settings for your ethernet adaptor are fine, so check the wireless adapter and make sure the MTU and RWIN settings are the same for both adaptors.

[#7]

As I indicated before, a wrong MTU will not affect wired much but can make a significant difference on wireless, so making the wireless MTU the same as wired may not give you optimum speed.