Installing WPA drivers in Win2K ?

I've got a dual-boot Latitude D800 with a Truemobile 1300 miniPCI card on it. I am having trouble installing the wireless drivers/utility on Windows 2000 - the main goal being to enable WPA-PSK as the current setup does only WEP. The file is R81435.EXE (Euro version, but tried US and Japan versions as well with same result).

At the beginning of install, setup will exit with a "DevMgr 502" error and claim setup is unable to continue. A partial workaround is to install the drivers from the .inf files rather than setup.exe - result is that driver is updated OK, but I am still unable to get the wireless utility nor WPA installed.

Wireless will otherwise work OK both on ad-hoc mode and against an Asus WL-500g access point on WEP but no WPA. If the same laptop with Linux, same drivers with ndiswrapper, and a third-party (i.e. Linux, non-dell) supplicant utility, WPA will work so I am pretty confident that the hardware and drivers are OK. This looks like an installer issue.

Questions:

- Has anyone had this problem?
- What is the "DevMgr 502" error? What should I do to correct it?
- Any way to work around, and get the utility installed without the standard installer?

Best regards,

-Felipe