My daughter was sent a program called My Web Searches (or similar) which added a toolbar to IE6. Since then she cannot get IE6, OE or MSN Messenger to make a connection. She has W98 as her OS. I have done a repair to IE6 but this made no difference.
Her machine is connected to a wireless router connected to a cable modem. It is one of three machines on the network and non of the others has a problem. I can still see the shared files on her machine from mine and she can print on the printer connected to my machine. ie there is not a problem with the network connections.
Is it likely she has a virus...although AVG6 reports not.
if you put your floppy boot disk in then reboot the pc and when the A:\> appears type without quotes."scanreg /restore " (Not forgetting the space between scanreg and /)then select a restore point before the problem.