Boot Camp - Windows can read Mac disk, but cannot write to it

iMac OSX Snow Leopard. Windows XP.
Can anyone help me resolve this. I have installed Windows XP using Boot Camp. The Windows folder is 31GB using FAT32.
Windows can read from the Mac disk, but cannot write to it (I get an ACCESS DENIED) error.
I have checked that permissions are set to Read/Write on the Mac, and have run permissions manager to check all is well. I have also tried deleting and reinstalling Windows, and creating a second User on the Mac.
When I boot into OsX then I can write to the Mac hard disk from another (Windows) computer on a network.
I think this did work initially, and it stopped working when I changed the computer name on the Mac (though this might be a red herring -- but it did definitely work OK yesterday).
I'm a new convert to Macs, but am experienced with Windows machines, and I would appreciate any pointers.

This is by design. The driver that allows access to the HFS partition is read-only. This prevents any possibility that Windows viruses could become an attack vector against the Mac OS. If you need to transfer files between Mac and Windows, you can always use an external hard disk or memory stick formatted as FAT.

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