Possible to create a partition after Windows 7 install?

[FutileBreadMachine]

I installed Windows 7 Professional 64bit, but I didn't format my drive first which had Windows XP 32 bit on it. It's a 500GB drive which I would like to split out so that Windows has its own partition. I tried using Disk Management, but it says I can only make another partition of 17GB since there are immovable files stopping it shrinking the main partition any more. Is there any way around this besides a full re-install? Can Partition Magic do the trick, or will it say the same thing about immovable files?

Many thanks for any help!

 

[FutileBreadMachine]

hmm..I've always had good luck with Parted Magic (free, fortunately). Could give that a try: http://partedmagic.com/

Ah nice, I was just looking at that. I was afraid it would only work for unpartitioned space. I can definitely create partitions out of an existing partition with that?