I am having a similar problem to mburns_df, I recently formatted my computer. After windows had installed I proceded to download all my drivers and all the windows updates (Im running XP Pro). After doing all this I found that I was getting a connection to the internet (I can ping sites etc) but internet explorer wouldnt work, msn messenger wouldnt connect and anything that required a connection wouldnt come on. I rang BT and they went through some basic tests but when they had verified that my connection wasnt at fault they didnt want to know. They did recommend that I uninstalled service pack 2 though, I tried this and then everything was fine, everything connected. After about an hour everything started to go again, IE became erratic and sometime opened sites and sometimes didnt, programs like msn messenger would work but only if they were run before it all went dodgy. All this became gradually worse till nothing would work again. I checked the forums for help and found a program called Winsock Fix, I ran this to reset my tcp/ip and to reset all the registry entries effectively resetting my entire connection. This worked perfectly but again, after about an hour or so it all goes erratic again. I really dont want to have to format over this but I dont know what else to do. Has anyone had any joy from this problem?