Upgrading Computers to Hoster 4.0x

[stublack]

I love hoster and am excited about upgrading all my laptops to 4.0.

My biggest concern is it seems the more of a geek that you are the better chance that you will have success and not need to come out to the forums to seek help after your install.

I have 5 laptops - 3 vista and 2 xp

On the 2 XP systems I think I have done all the custom updates.
I know I have service pack 3
I assume I have Internet explorer 7
I assume I have Window Media Player 11 or 12 (who knows)
I don't know how much RAM I have I do know there is a football team in St Louis called the Rams.

If I have success upgrading 4.0 on the two XP systems, I think I want to convert my 3 Vista machines to XP (more stable), if I do that will I still have the Hoster registration codes so I can do the upgrades for those machines.

Any suggestions