Upgrading Computers to Hoster 4.0x

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I'm pretty sure I will be converting my 3 Vista systems to XP. What is the best way to accomplish that and still be able to do the 4.0 upgrades. I realize this may seem a dumb question but if I get rid of Vista and install XP it seems my registration codes will be gone. Am I wrong? And can I still do upgrades without them???

It was not a dumb question after all was it?

i uninstalled hoster 3.321(add remove programs) I installed XP and my registration codes were indeed gone just like I thought. I could not do installs or upgrades without the registration codes. I made a huge mistake and I'm paying a very hefty price for that mistake.

So for my other 2 Vista laptops what should I do different to load XP on them without a glich, that was my original question and hopefully the answer I get will not require me waiting for MTU to reply to a support ticket like I needed to do for my first conversion (Compaq)?? Is there an answer???