Home network problem

Since everyone is having a slow week <g> I need some ideas on a problem.

At home I have Comcast broadband, Linksys BEFSX41, a Dell desktop (XP Pro),
an AEC desktop (W2K), and a Thinkpad (W2K).  The Dell is where I have the
printer installed and shared (supposedly).  All are totally current on
Windows Update.  No domain, just a workgroup CROSBY.

For some reason, I cannot access the Dell from either of the other PCs.
Expanding My Network Places never shows it.  If I do a search for computers,
I can _find_ the Dell, just can't _access_ anything.  Administrator has the
same password on all 3 machines.  The Dell runs Zone Alarm (XP firewall is
off) but it makes no difference if it is active or not.  From the Dell I can
see and use shared directories on the other 2, just not vice versa.  I get
"access denied".

This has been going on for well over a year, maybe 2 years.  I have tried
simple file sharing and not simple file sharing.  I have tried the
troubleshooters.  I have asked tech savvy people I know.  I asked at the
local PC store where my company buys stuff.  And at one time, it definitely
worked.  Because it was sometimes months between trying to use the printer
from one of the other PCs, I really have no clue what might have caused it
to start failing.  Just one day it didn't work anymore.

Any suggestions?

Thanks.