problem with home networking

I have developed an interesting problem with my home network. I have a belkin
wireless router hard wired to a computer running xp home(call this 1). I have
another computer(2) connecting via wireless. Both can access the internet
without problem. From 2, I can see 1, and can access shared files. From 1, I
can see 2, but cannot access shared files or printer. Both are on the same
work group. When attempting to access 2 from 1 I get the following error
"logon failure: the usre has not been granted the requested logon type at
this computer. I cannot even map a network drive from 1 to 2. I believe this
to be a browser issue, but have thus far been unable to resolve the issue.
Dave