Hi there, this is my problem: I have a netgear wireless router 834gt which i have used for the past 8 months with no problems. I have a xp pc that connects wirelessly using a usb adapter, and a xbox 360 with wireless adapter that both work fine. I also have a windows 2000 pc that is wired in that also works fine. Up until now, the vista machine that i use as my main pc has worked perfectly, able to connect at all times. This is WIRED directly into the back of the router. Today, vista comes up with the message "limited connectivity" on a unknown network. This means I am unable to connect to the internet or content on other pcs via wireless LAN. Things i have tried so far: tried different ethernet cable tried different port on the back of the router (in case one had burned out) reset the ipv4 and ipv6 settings to default used vista's AMAZING self diagnosis tool to no avail reset the router updated the routers firmware (despite the fact it has previously worked) uninstalled the network port drivers and installed them again, but cannot update driver due to no internet attempted to create a new network in vista but it cannot find any attached devices disabled firewall used cmd prompt to reset the various networking things attempted to system restore but for some reason their are no points present despite the fact it is turned on booted in safe mode with networking, still same problem all the other machines, be it either wired or wireless are able to connect, so im pretty sure this is a vista issue. the only thing i have done to the pc since it has been working is defrag it with Perfectdisk2008, which also defrags the system/boot files when you next reboot the pc. the only thing i can think of is that this defrag of system files has somehow affected the networking (i know it doesnt make sense!) please help!