Verified answer

1-it makes sure your pc is up to date 2 no it just updates windows xp files to make sure your pc is runing right 3-no dont worry

Anything (ie programs) that rely on the registry may need re-installing, as the files and settings transfer wizard is rather lame.

If you install winohes to another directory(Ie: c:\winhoes) and upgrade that one, you should be able to run both os's, with the other only being a reboot away.

if your dsl modem came with a disc, that installs account information onto your computer, then you shall need that disc fo xp, but if you no-longer have it, I'm sure ur ISP will send u a nu one.

The XP upgrade will copy all of the windows xp files to your harddrive and let you use XP

more detailed:

A- Asks you to start setup

B- Lets you choose upgrade or clean install

C-Asks for a location to install your OS or just puts in 'C:\windows' folder

-------------------------------------------------------------------------------You may not have to reinstall your programs. Just make shortcuts after the install.

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Your modem installed a driver it will remain.

Hope it helps