One of things that has improved a lot is the Windows ability to detect and connect to Internet But I still get into situations where (specially with my NAT and consistent testing of new ideas and tricks) that I end up correcting the TCP/IP stack. I got another IBM computer day before yesterday and I got into trouble again. Well one quick command that you can try out to rebuild the TCPIP stack is by means of using netsh network command shell. This is mentioned on my list of tools page and I would be describing its capability in great detail whenever I get some free time. But for now try this command netsh int ip reset mynetsh.log . This would rebuild your TCP/IP stack and a log of activities would be created in mynetsh.log (by the way you can give any name to log file as long as you do give some name).