It didn't work out for me, I had to do a clean install (which I'm glad I did now). XP Media Center Edition is a challenging install, however I have it down pat now. I simply formatted XP Pro, and installed the Media Center Edition. It's really much the same OS as XP Pro, with a few enhancements that really makes your screen look good and colorful, it looks much better than the regular XP versions do.
It makes me wonder why this OS wasn't a success, I wasn't even aware of it, until becoming a TechNet subscriber.
Unfortunately, most pre-XP OS's are no longer available for download, per some agreement with Sun (Oracle). There were a couple more that I was interested in, especially Windows NT 4.0 & 98. Guess I'll have to purchase them on eBay.
Thanks for your response, Ian!

Good to hear from you again.
Cat