I have had an iMac since July, and up until now, i have never had any problems! My 3 windows computers do not show up under shared anymore. I have an Xp Desktop, a Vista Desktop and a Vista Laptop, that until today all would show up. Now nothing sows up at all. I have an iBook that when on shows up, and the weird thing is that my windows computers show up on the ibook. Any Ideas?