My pc can not detect my time machine formatted external hd

Help! I purchased a new western digital external hard drive(320gb)to use with both my pc and mac.
when i first attached to usb hub on my macbook pro, I answered "yes" to the question if I wanted to use the drive as time machine backup..it said that all data would be erased(none on the drive; it is new)and my contents of mac would be backed up.
I was able to tranfer some other files to the wd external drive that I wanted to transfer to my pc, but when I plug the hd into the pc, my pc does not recognize the drive under "my computer" as an external or removable drive.
If I look in the drives file under "mycomputer" it does list the wd as a drive, but I am not able to transfer files fromy my pc to the external hd or vice versa.
What am I doing wrong?

When you formatted the drive you should have created two partitions - one for TM and one for FAT32
Plugging a TM drive into a PC can hose the data on the drive. Be extremely careful
PCs cannot read HFS+ format. Only NTFS or FAT without special 3rd party software.
You might try HFSExplorer
http://ogasawalrus.com/blog/node/208
or macdrive
http://www.mediafour.com/products/macdrive/

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