Broad band - wifi connection problem

Hello,

Am using wifi broadband connection from bsnl(model no.WA3002G4), the problem is wifi not proberly connecting to the labtop.. connection broken up frequently.. i have tested my friends modem which was does't have wifi router that connected proberly to my system(it s connected thru lan cable) ..

pls help me to proceed further...

Thanks

Regards

sathis