Wirelessly connecting Windows laptops to an iMac G5 to share files Interne

I am wondering if someone could tell me how I can share files with windows PCs wirelessly but also securely. I have setup a network so that Windows PCs can access my iMac G5 that connects to the Internet through the airport card. I can get the windows PCs (laptops) to access the Internet through my iMac G5's airport card but I also want to share files back and forth wirelessly between the Windows PC laptops and the iMac G5. I am able to view all my iMac G5 files on my Windows PCs but that's not what I want. Isn't there a way to make it more secure so that only a shared folder is available for access by the Windows PCs? Right now if I go into Windows and setup a "My Network Places" then the PC has access to all those files on my iMac and that's not what I want. At this point someone with access to my iMac G5 could just wipe out everything. Not secure at all.
Could you guys give a novice some pointers?
I am still having problems with this. I can get my laptop to share my internet connection with my mac, but once I set a password on my Mac--well I can't get my laptop to connect. It is quite strange.
Someone suggested me to look here:
http://docs.info.apple.com/article.html?path=Mac/10.4/en/mh1161.html
I tried to follow the directions on the link he suggested, but I'm using OS 10.3.9, so maybe that is the reason the directions are not exactly the same for my system.
Right now, I can open the System Preferences, go to Sharing preferences, turn on windows sharing...but that's as far as I can get.
Do you know if there is any document that can show me how to securely share files with a windows PC for my version of Mac OS?
I would also like a way to share files from my iMac to the Windows PC as well.
I have successfully been able to get my Windows Vista laptop sharing the internet connection with my iMac. The problem is that this connection is insecure, so therefore anyone can connect.
I have no idea and have not had luck finding any fix for this by browsing/search the knowledge database.
How can I set it so that anyone that wants to use the shared Ethernet connection (via my airport) has to input a password?
Every time I try to associate a password with the connection, my laptop is unable to share the connection any longer.
Windows will just tell me that the wireless connection is incompatible because of the security features of that network. It doesn't even ask me to input the password.
Besides this, I still am unable to get the file sharing to work. Is this because I'm also trying to share an internet connection between the two computers?? or...
After working on this problem for awhile, I've found some helpful information on the web that refers to connecting a Vista computer to a MAC with OS 10.5. Even though this is the case, I got my iMac to share it's internet connection and now I'm able to access the Windows vista laptop files on my iMac. I still, however, am unable to access the files on my iMac through the laptop. I've followed all the info on this website:
http://www.ifelix.co.uk/tech/3022.html
but I'm still not having any luck.

I have successfully been able to get my Windows Vista laptop sharing the internet connection with my iMac. The problem is that this connection is insecure, so therefore anyone can connect.
I have no idea and have not had luck finding any fix for this by browsing/search the knowledge database.
How can I set it so that anyone that wants to use the shared Ethernet connection (via my airport) has to input a password?
Every time I try to associate a password with the connection, my laptop is unable to share the connection any longer.
Windows will just tell me that the wireless connection is incompatible because of the security features of that network. It doesn't even ask me to input the password.
Besides this, I still am unable to get the file sharing to work. Is this because I'm also trying to share an internet connection between the two computers?? or...

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