Add partition post Win XP install

I've formatted and installed Win XP Pro on a 250 Gb drive. Can I add a new partition on that same drive? In other words, can I have drive C: take up only 100 Gb, and drive D: take up the other 150 Gb? Disk management recognizes the entire drive as C: and thus does not allow me to add/break-up the drive.
Can this be dione in Windows XP or is there an after market program. Thanks for any help.
 
I have also used Partition Magic and it worked perfectly. HOWEVER, the antivirus to use in this situation is Norton. I used another antivirus and the partition did not react well. So says my IT guy. If you're going to do this, use the Norton Antivirus, not another. It worked perfectly.
 
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