Shared Documents folder - wireless

I have an XP home computer and an XP pro computer on a wireless (D-Link). I
can share printers and folders EXCEPT for the built-in "Shared Documents"
folders. All my shared folders - except Shared Documents - show up in the
appropriate computer when I view them at My NetWork Places. If I try to Add
Network Place, enter the address (\\<computername>\shared documents I get
"The Folder you entered does not appear to be valid. Please choose another"
I get this if I enter the network computer name AND even the local name.

Related - I think: I have a network set up via the Network Setup Wizard the
network it sets up is not recognized under My Network Places \ Entire
Network \ Microsoft Windows Network. The above mentioned folder sharing and
this Entire Network stuff worked just fine when I initially set it up a few
weeks ago. Not now. I've run the Network Setup Wizard many times - just
like I did when I originally set the network up - but to no avail.

Any ideas / help??