Wifi router with windows 2008 server problem

Hello,



my problem is that there is two wifi router are placed in my organisation named airtel 2 and airtel 3 and we have some desktop , notebook and mac's with windows 7 installed on every system we all r using internet throgh these 2 router now what i wanted is i have purchased a server with xeon processor and 2 tb of hard disk 8 gb of ram now all i want to connect all system through server but the problem is that both router has defualt ip's and how to connect these publict network with server no lan is there all r wireless
i am frustrated plzzzzz help me out anyone