IP Address Keeps Changing

I have the wrt350n router with two computers wired to it.  I have winxp home on both systems.
When I do the cmd command and then IPconfig  it will give me the router ip and the ending numbers are usually .100 and .101. 
Recently these number have been switching.  One week my main computer will be 100 and a week or so later it will be 101. 
This messes up my port forwarding setup, so I keep having to modify those settings.
My question is,  what causes this and is there a setting I can put on my computers that will not allow this number to change? 
Any help will be greatly appreciated.
thank you

You use automatic IP addresses on your computers. When you start your computer it obtains an IP address from the DHCP server on the router. The DHCP server leases the IP address to the computer for 24 hours or until you shutdown the computer. The DHCP server usually picks the first available IP address starting at .100. Thus whichever computer comes first gets .100.
The computer which requires the port forwarding should never be assign dynamic IP addresses. You cannot configure the Linksys DHCP server to assign fixed IP addresses thus you have to set a static IP address on the computer like this.
Important: do not choose a static IP address inside the DHCP server address pool. By default the pool is 192.168.1.100-149. Choose any IP address outside this range. Otherwise you may end up with occasional IP address conflicts.

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