System is not in network plsss help

[Prashant]

Hi !!

i m using P4 1.7ghz with 128mbram wipro systems with realtech network card i had 20 system in network with 24 port dlink switch with tcp/ip no starting from 192.168.0.1 to 20 now one of my system is not in network but dat systems network status showing dat it is network or when i ping its tcp no. its giving reply.. but when i ping another systems no. form dat pc its sayng urechable host name.. i cannot acess dat pc on network ... please find me a solution