Sharing files XP and OSX (leopard)

Ok my setup goes as follows:

Mac (leopard) connected to Airport Extreme Via Ethernet

Pc (Windows XP) connected to Airport Extreme Via Wireless

Both computers are online, and that part works perfect

I would like to know how I can share files from my Mac to my PC and vice-versa.

As you can see in the image below the PC shows in the finder, it just keeps saying connection failed. do i need to set anything up in windows?

I've turned on share files and folders using AFP, FTP and SMB in sharing (system prefs)

What could I be doing wrong?

So grateful for any help, thanks in advance!

Raph

 

thanks so much man!