I am currently using a PC at my in-laws house (it's hooked up to a modem (NetComm NB5 ADSL2+ Modem Router) which in turn is hooked up to another PC). We are on a broadband connection and when I boot my PC up I have access to the internet no problems. After around 3 hours the connection drops out (no web pages load on Internet Explorer and Windows Messenger drops out). The thing is the modem still has all the same lights on and when I go to Network Connections it says I'm still connected. The other PC which is also hooked up to this modem never has this problem.
If I unplug the modem and turn it off and then re-plug it all back in it still doesn't re-connect. The only thing that makes it re-connect is if I restart my PC. What is going on here?
I am on Windows XP with all the latest updates. I used to have this PC at home and it never used to do this on my broadband connection. My brother-in-law used to have his PC hooked up the same way as mine is now and he never used to have this problem.
Any help would be appreciated.