When you get the CD don't just go for the Windows install. First thing to do is to delete ALL the existing partitions on the hard disk. That makes sure there is nothing left from the old system to interfere with the new install. Then create a brand new partition, format it NTFS and then do the install.
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Do you know that we're all in line for succession to the throne? Really?
Well, if forty-eight million, two hundred thousand, seven hundred and one people died I'd be Queen.