In XP can not get continuous partition.

[Holiday]

I'm planning on installing ubuntu to my laptop by first using the Knoppix 
partitioning utility. I'm currently using XP Home's defrag utility to get 
the drive into shape. I've managed to free up about 2/3 of the 40G drive, 
and defragged to get a nice big empty space. EXCEPT! Except that right in 
the middle of that space is a swath which sometimes appears as green 
(unmovable) and sometimes as blue (contiguous).

I've set the swap file to 0, rebooted, run defrag from safe mode - this 
makes no difference. The thing won't budge.

Any ideas what this area is, what I can do? 

I'm assuming this will seriously affect my ability to create a non-xp 
partition. Is this assumption correct?
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