There are generally three ideas that come to mind regarding your issue with this wifi card.
First I would like to know the process by which you are attempting to install the card.
The recommended installation process is to install the Software for the card with the card NOT YET
physically installed. After the software install, you shut the computer down and plug in the card, and restart
the computer. This has to do with the way that windows communicates with the wifi cards.
If you try manually installing with just the driver then I would NOT expect the card to work right.
Don't Forget to read the Manual before installing.
The next thought I have is, could you possibly have a bad PCI or PCMCIA card slot? You may want to attempt
installing another card of any kind, maybe a modem or sound card and see if you have any issues with those.
I don't believe this is the culprit but without testing you won't know. Another option there is to attempt installing that
card in another PCI Slot. However, it still sounds like you might be putting the horse before the cart.
Again attempt installing the Software before ever installing the Card physically.
The last piece is somewhat minor, you may want to check that msconfig isn't set to be more restrictive.
If you click START: RUN and type "msconfig" and make sure normal startup is selected. other than that
DON'T Mess around with msconfig because you could regret it. It's for diagnostic purposes only.
Get back to us with what you've tried after this.
PS You NEED THE SOFTWARE FROM LINKSYSWMP54G Driver