1. What are you installing XP over?
2. What do you think is the source of the other OS?
3. How many partitions do you have on your disk?
4. Size of disk, partitions and free space?
Can you back up your files on another partition and do a
clean install?
You must have got a copy of he 'OEM' version. This is intended for new
machines and will not install it it finds any existing windows present.
You would have to remove those first.
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