Hopefully I can help end some of the confusion with Windows Update for 98/ME leading to the "Thanks anyway but you have a Mac" screen.
It seems to me that Microsoft is having problems with the site that they're not in a hurry to fix.
My experience after a reinstall was that I could not reach Updates for about a half hour. Then I reached it and downloaded critical updates. When I went back to download some optional updates, I got the "Mac" screen again. I just tried again every 15 minutes or so untill I got back on.
Opening two browsers did nothing, deleting cookies and temp internet files did nothing, and the Winsock Fix definately has nothing to do with the problem. I think it was just coincidence that those things seemed to work.
Be patient and keep trying and you'll get there. And prepare for the day when you can't access the 98/ME updates at all.