tried removing IE from add/remove and adding again. this did not help.
However problem seems to have been resolved by using auto config scrip for LAN address rather than auto detect. This did slip once but I think it didn't like that left both ticked. Seems to be okay now.
appears to have been fixed by using automatic configuration script rather than auto detect settings for LAN, pointing at router address (although this has changed from the router address I typed in to another 'generic' type address 127.0.0.1....etc) Fingers crossed.
This thread is now locked and can not be replied to.