Please note that if you installed windows on this Hard Drive
when it was on another computer,then you won't be able to
boot your new computer with this hard drive.

Do you have the other...

A blue screen generally occurs if there is a RAM problem but
it could be something else.

Do you get this blue screen immediately after you boot your computer?

When you boot your computer...

You mean you want to have a backup of the data on your user computers to a certain location on the network?

Its good that your using a domain environment, you have different options to use:

1)...

You have to play with the registry inorder to change the name of the start button. If you are a non-tech user, then please dont go for it.

He actually means to "uninstall" the device from the Device Manager.
Just right click on the Hard Drive and click on uninstall.

If the Hard Drive doesnot get detected than right click on it again...

Thats what I was about to say,there must be a problem with the driver of the External Hard drive or the jumpers.

Does he even have an administrator account on WinXP?

If he does then he can simply log into it with an admin account and go into
C:\documents & settings\user profile.

By user profile I mean...