Installing XP Problem

[divine]

Having a juggle around of the PCs while my parents are away and to cut a long story short this has led to me putting a 160GB IDE drive in my old 3500+ machine as the primary HDD.

This was in two partitions, one was about 100GB and the other about 50GB. The 100GB partition has about 20GB worth of data on it that is being carried over from the old PC, the 50GB partition is empty.

In XP Setup, these show up as C: and D:, D: being the 50GB one I wish to use.

So first off I just tried to install it (it was already NTFS) and XP said no, not compatible it needed space on this disk, and listed the disk I was trying to use.

So I deleted the partition and recreated it and tried again. Still no.

From what I can gather, it's probably only going to let me install to the 100GB partition for a reason I cannot fathom. Is there anyway I can make it use the partition I want?