Shoutbox

I've done this: (as the site recommended by mwe99 said)
(1.    Double-click My Computer on the desktop.
2.    On the Tools menu, click Folder Options.
3.    Click the View tab, and then select the Use Simple File Sharing (Recommended) check box to turn on Simple File Sharing. (Clear this check box to turn off this feature.))

computer B has that and it is enabled (probably why Computer A can see its folders. but when i try it on computer A it doesnt have that option to enable....is there any other way to enable it? thanks