Sounds like the two OS versions in the same partition in a separate folder, a definite No No!
Your best bet is to comlpetely uninstal and format the hard drive and then instal XP Pro.
There are occasionaly problems encountered with these Dell mass produced PC's with sepecific drivers, etc, preinstalled on the original OS CD!
Give it a go. If no good you can always in the meantime reinstal the original OS CD.
One other thing to be aware of- is the original OS CD contain a full WinXP Home OS or just a repair CD?
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