I've got a Thinkpad 560 running Win98SE with all current updates. It connects to the Net fine via dialup and Ethernet through a Xircom PCMCIA card, so it appears that the protocol stack is OK. But I've tried two very different wifi adaptors, an Orinoco PCMCIA card and a Netgear USB dongle, and neither of them will work. They both indicate a good radio connection with my access point, and my other laptop (a TP 600) works fine with that AP, so there appears to be no problem there. But neither of these adaptors appears when I run winipcfg. They aren't connecting into the stack.
I've verified all the Control Panel network settings and removed all unused protocols. I removed the Xircom card and rebooted, so I don't think there's a conflict with it. I shut down my firewall. I ran winsockfix, just in case.
I've googled a lot but don't find any discussion of this situation. Any suggestions?
The Thinkpad is second hand, used originally in a corporate setting. Perhaps their admins disabled something inside? Any idea what to look for?