3 pc network problem?

I have 3 pc’s connected to a linksys 5-port hub.
all pc’s can access internet but not each other.
can ping ip’s,but not name.
ran xp home network wizzard on all pc’s.
all pc’s set to same workgroup.
all pc’s only show local shares,not other 2 pc’s.
access to my-network states admin. deny from other pc’s in workgroup.
how do I correct above problem?