Okay, on XP, please perform these steps:
1. Start-->Run
2. type in "cmd" (without quotes), press Enter
3. In the command prompt, type in "ipconfig" (no quotes)
4. Look for "IPv4 Address" (or IPv6 address if you use it), Subnet Mask, and Default Gateway
5. If they are there, you are good to go on your PC.
As for your Axim,
Take a look at
ikehiker's wi-fi guide, if that doesn't help, please tell us.