Welcome to TechIMO!!
As for your question, I have used Windows 98 a couple of times. I would actually avoid installing Internet Explorer 6 in Windows 98 since its actually not worth the time because its almost the same as the other versions, and if you chose IE 6 then you will have to download a bunch of security patches and other fixes and that will take both space and time. Other than that I havent had any problems at all with all the other updates. Many of my friends use Windows 98 because of gaming and they downloaded IE 6 without any problems and they are happy with it. I just think its useless because of the reasons stated above, but many others like it anyways. I hope this helps and that you enjoy our home as much as we do
Feel free to contact me if you have any questions or problems or you can always as you already did make a new thread
dan