I was recycling an older PC for a friend last weekend and discovered something strange. The person the PC is being given to can’t afford to buy WinXP and, even if they could the PC is a bit low powered for using XP. So I decided to keep it on the Windows 98se it came with from HP. After upgrading IE to version 6 this is what I see when trying to do a Windows update.
It seems that once you’ve got IE6 on Win98se, Microsoft doesn’t want to give you the other security updates. Fortunately there is the unofficial Windows 98 SE Service Pack, it will give you all the security updates that were previously released by Microsoft.
Paul Hutchinson's Blog 