PC cannot recognize iMac's external Hard Drive on network

I have a network with my PC and iMac. The iMac has an external hard drive that I recently added. I can see my PC from the Mac and I can see the iMac from the PC. What I cannot see is the external Hard Drive connected to the Mac from my PC, only the normal folders on my Mac. Can't find anything to allow me to do this.
Any ideas?
iMac   Mac OS X (10.4.3)  

Before I tried the software suggested I spoke with my son who finally gave me a script to enter in terminal which added the external drive as something that would be recognized. After a few tries it actually worked and I can read and write to my external drive from my PC. Thanks for the advice and assistance.
Now I just have to figure out how to get iLife 06 to load as it keeps crashing my Mac. Tried 6 times and now I have no iPhoto nor the iWeb, 2 of the 3 programs I really need and use!
Happy "Mac"ing.

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