Win XP file systems

I have a computer running Win XP with two Hard drive partitions. The C:\ is using the NTFS file system but the D:\ is using the FAT32 file system. I think this is rather odd but I haven't encountered any problems thus far. I was wondering if this would hinder the performance of my system and if I should just reformat the second partition and tell it to use the NTFS as well. Thanks in advance for helping a newbie out.

Edit: Thanks for helping me out guys. The NTFS conversion was successful and only took a few minutes.<P ID="edit"><FONT SIZE=-1><EM>Edited by Mike8023 on 07/12/03 11:57 PM.</EM></FONT></P>

Is your PC connected to the Internet?
Do you have important data on your D drive?

If you answer yes to these questions then you should reformat the D using NTFS because the main characteristic of NTFS is security. With NTFS you can use EFS to encrypt your personal files plus you can assign user right to allow or deny access to your files based on user rights.
In other words, you can configure EFS to allow access to your secretary to the payroll files but deny Tony good for nothing new employee access to the same files