after the reboot ip address are getting lost

hi..
i have a small lan with

2 desktop pc's
( a. cpu p4 2.8Gh
ram 1Gb
hd 120 Gb
lan card 3com wifi
os win xp pro sp2


b. cpu p3 750 Mh
ram 256Mb
hd 20 Gb
lan card 3com wifi
os win xp pro sp1
)

and a laptop 3.2 Gh
ram 512Mb
hd 80 Gb
lan card wifi
os win xp pro sp1


my access point is 3com

all the hardware part works perfect

i use ip address 10.0.0.1 -2 -3
and submask 255.255.255.0
at the tcp/ip protocol

the signal of the lan is "perfect"

when i "write" the ip addresses the wifi lan works perfect

but when i reboot the ip addresses return in automaticaly mode and my ip
adresses are disable..

can i do smth to use the ip that i want


thnks... for reading