Turning on Internet Sharing via Airport disrupts internet connection!

I have a very strange problem.
My iMac G5 (10.4.10) is connected to broadband via an Ethernet cable. Everything works perfectly, Google Earth works, emails come through, internet downloads are perfect...
BUT!!
When I turn on my Internet Sharing to share my Ethernet connection via my Airport connection (to let my husband surf the net on his PC) all **** breaks loose on my Mac.
Google Earth does not function properly, all internet downloads (.dmg) come up with "codec overrun errors", all images sent via email downloaded through Entourage are corrupted, the list is endless. I have to turn off my Internet Sharing, turn off Airport, and then everything returns to normal again.
Why is this, and can someone help stop the fights my Husband and I are having when it comes to sharing the Broadband connection through my Mac - I don't want to because my Mac goes crazy!
Ta muchly!!!

Sorry but an Ethernet hub will NOT properly share the ISP connection. The ISP only gives you a single IP address. If you use a hub (or Ethernet switch), the first computer you turn on will win and get the only IP address. The other computer will not be able to connect.
To properly share the connection, you need to get a router. The router uses the single public IP address provided by your ISP and creates multiple local IP addresses for your computers.

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