Does anyone know of any partition resizing software for the Windows XP 64-bit platform?  Partition Magic doesn't seem to be working propely on it and I need to install RedHat as soon as possible.

If you're trying to resize a NTFS partition, you can download Knoppix and run qparted.  I've run it on a couple drives before with no ill after effects.

I used cfdisk which came with the Slackware installation. I haven't looked into much, though maybe you could use it.