Missing Icon for Computer on Network

[Ingit]

I have 4 computers on a home network running through a Linksys router. I
can see 3 computers in network properties, but 1 laptop does not show up.
If I'm on the laptop, I am able to see all of the other 3 including the
laptop. If I'm on one of the other 3, they just show themselves and not the
laptop. If I go to search on one of the other 3 computers and type in the
name of the laptop, it shows up in search and then I can access it. If I
want to map the E:\ drive on the laptop, it does not show up, because the
laptop doesn't show up on the network. Everything is properly shared.
Running zonealarm, have windows firewall turned off. DHCP enabled, with a
specific range in zone alarm, to include all 4 computers.

I have the power function on the laptop set to turn off the monitor after 1
hour, and HD's after 30 minutes. Does this have anything to do with my
problem?

hope this isn't to confusing.

 

[Ingit]

never mind. I used the default "connect to the internet," following all of
the default settings for connecting to a workgroup and it's back. reading
other posts, I assume SP2 changed something, or left something as is, and
changed my other boxes? anyway, I'm OK.