Nmap says hosts unreachable

[Eric McGrath <ermcgrat () oakland edu>]

I'm running an XP home machine with service pack 1.  I have a
zonealarm firewall and a linksys wrt54g router.  No matter
what host I scan nmap always says that the host is down.  Even
scanning pcs on my lan or my own wan ip I get the same result.
 When I ran nmap with my bsd system it worked fine.  I
followed the install on insecure.org but I just can't get nmap
to work.  Any suggestions? Thanks!

Eric,

I would use my bsd system but I don't have it running anymore :(

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