I am using it on an Xp system and a W2k system which worked fine a few weeks ago when i Set it up. both I am using the Dlink connection manager, it shows the router at 100% signal but does not connect now. also the light flashes at different intervals on both systems. long steady flashes on the Xp and 1 long 12 short on the W2k. If anyone knows the error codes can I have a link please. I took this adapter to another network, wrt54G, and I was able to set it up fine with W7.