1-To set DHCP First  we need dhcp service that is taken 
from start-program-add or remove program-add remove windows 
component-network services- select dhcp-next-next-finish.
2-now start- program- admin tool- click on DHCP-r click on 
dhcp server - put start ip address as 192.168.0.10 and end 
ip address as 192.168.0.100 now follow the simple step if u 
want to reserve some ip address u can select reserve option 
here a lot of option u can set according to your need.
advantage- it will be provide ip address automatically.