I am having three computers but having problem in only one of those three computers. First machine is a Windows 7 Home Premium 64 bit which is upgraded from Vista 64 bit, this is working well. Other one is a Windows 7 Ultimate 64 bit which is on dual-boot configuration with Windows XP. The Windows 7 before had Windows 7 RC-1 was installed which not at all had any troubles. Now through the store purchased version it has extra problem but this is not with the internet connectivity problem. Third one is the Windows 7 Professional 32-bit which was upgraded from Windows XP. This is the computer is only facing the problem. All of these are hard wired to a Linksys/Cisco router along with the cable connection. What I am not able to understand is why this trouble just happens on 1 out of 3 computers. The only dissimilarity that I can observe is 32-bit vs. 64-bit but I don’t think that this will matter? Please help.