Sharing files between 2 Vista PC's

Hi there

I have 2 PCs both running Vista Ultimate. One PC is wirelessly connected to
a router, the other PC is wired direct to the router, which is a gateway to a
cable modem to my ISP.

I can share my wireless PC's files , however i cannot share my wired PC's
files to the wireless PC. It can only see the share "icon" in the "Network"
window. When double clicking it i get a message saying "Windows cannot
access \\xxxxxx. Check the spelling etc.."

Its odd that i can view/copy/etc one way but not the other.
Both PC's are setup identically, on private network, with network discovery,
file sharing and public folder sharing ON, the rest OFF.

The shares on both PCs are available to "Administrator" and both PCS are
logged in as Administrator.