windows ce download site

http://www.hpc.net/

http://www.pcworld.com/downloads/1509/topic.html

http://www.cnet.com/topic-software/microsoft-windows-ce.html

http://www.pda-archives.com/wince/1.htm

Of course, I got these with a search, so do dive into them and browse in more detail. I won't be able to help you with the second part of your question though I think that you should check the system requirements as Win XP is a much larger OS than CE. Plus, CE is an embedded OS isn't it?