I am having a terrible time trying to find drivers for the Linksys WMP54G pci network card for XP pro x64. It seems that Linksys havent produced anything yet, and all the other drivers I've used so far havent worked. I'm not sure which version of the WMP54G I have, but the Linksys tech support told me that if the box doesnt show a version # next to the model #, then it is version 1.

Does anybody know a way to get my card working on XP pro x64?

Bump - Please, I need help with this.

I had the same problem with my WMP54G wireless adapter, since linksys does not provide a 64 bit OS compatible driver. I found (through Google and Linksys live chat) that the v4.1 device uses the ralink 2561 / RT61 chip.
here is a link to the driver:

>>http://www.ralinktech.com.tw/data/ [...] 1.0.24.exe

install and use device manager to locate the driver
"C:\Program Files (x86)\RALINK\RT6x Wireless LAN Card\Driver\~"

Since you are using an older version of the WMP54G you might try older ralink drivers if this doesnt work