Network Problems

[wtdz90]

I am running 3 computers off of a wireless network. One is hardwired to the router. that is a windows vista with avg free cirus software and all the router software. This computer runs fine. I also have a windows xp computer with avg free and all updates are up to date on alll of these. and that computer runs fine. Then the third computer (the problem computer) is my new alienware laptop. Everytime i turn it on and it tries to connect to the router it disconnects every computer in the house to either local only or limited connectivity. then i have to restart the router sometimes 3-4 times in order for all of the computers to connect. then they can stay on no problem and everything runs great till i turn the laptop off and have to turn in back on. i have tried my laptop at other locations too and it doesnt have any problem. is there something wrong iwth the router? mayeb a setting or something