Strange, it installed fine in the 8 other XP machines I have running. The only difference is that this version of XP is different to the others, its Windows XP Media Center Edition Version 2002 Service Pack 2.
Pete
EDIT....Indeed I did have compatibility mode switched on. I'm installing through Norton File Manager for Windows 95 and I needed toturn on compatibility mode yesterday and forgot to switch it back....all is fine now, well spotted