Trojan Win32@mx

[#1]

Its not plugged into a USB 1 port is it ?
You will only get 54M if its connected to a USB 2.0 port.

[#2]

Surely both your PC and your router have wired capability?
i.e. Ethernet connections?
You just need a few feet of wire for a vastly superior performance to 11Mbit wireless.
(That 11Mbit is marketing-speak - true speed will be less than half that.)

[#3]

My son is between flats, shall we say, and is temporarily living with us. It is his pc that only has a 11M link to my router. His pc used to be my pc, and when it was my pc, it was connected to my router via a wireless link working at 54M.
I want to get the wireless link going again at 54M, rather than just hard-wire the pc to my router, because in two or three weeks he moves out to his new flat, taking his pc with him. There he will need to use a wireless link hence the need to discover the answer to this problem.
Sorry if that sounds a bit abrupt, but I want you to understand why I need to go the way I am trying to go. I'm sure there's a way.

[#4]

Have you tried removing the wireless device from windows using the device manager and then on reinstall tell it to use the latest drivers which should be downloaded in advance

[#5]

I hadn't but I have now. Unfortunately it made no difference, so I uninstalled the Belkin s/w and borrowed my Netgear USB device from my other remote pc. I loaded that s/w too, but even with the Netgear device, the link speed is 11M.
Thinking about it, I seem to remember that when the pc was my remote pc (and using the Netgear device) so worked at 54M, the pc had Win 98SE with USB s/w loaded. The pc O/S only went to XP Pro after my son took it.
Could that be the answer, the USB s/w?