Router is not getting connected with laptop

Hello,

I am having an ADSL connection at home (with wireless router & lan options in the modem) which is working very fine with my laptop, cell. phone. I have used two / three laptops using LAN and wireless as well.

Recently I brought a laptop and tried to connect to my home network, but without luck. I have tried all possible ways (LAN, wireless) but still it is not getting connected with the network.I found whenever I am trying to connect the laptop with LAN cable at my home network it tries to connect again & again (ending with network cable unplugged) and in the main time it disconnects my ADSL modem from internet as well.

I took the same laptop in my office & to my friend's home network and it get connected by both ways (LAN, wireless) at both locations.

I tried by working with static IPs also but still it is not getting connected (except wirelessly with limited access). The only difference found by making static IP is, i can access the router (192.168.1.1) with wireless connection but internet remains disconnected from the device, (as long laptop is connected with the modem).

I hope my query and details are clear. Please advice!