One thing I usually do before upgradeing is to set a restore point BEFORE you start the upgrade and then if there's a problem you can restore back to it. It has saved me a couple of times.
I haven't done this my self but I have read of someone else doing it.
Register hoster using a floppy disk and then keep the disk with you. I'm guessing you'd have to do a remove/install to use it.
Sam
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