Pipex and Linksys

I have a Linksys BEFDSR41 wired router, with combined modem. My ISP is
pipex 1Mb ADSL. I am having problems with use of IE6 on win XP. My
internet connection stays alive because downloads continue, but I cannot
access webpages. The only way I can connect to webpages is to go into the
router setup on 192.168.1.1, and click apply. Once this is done I can
access IE pages and download etc for about 20 mins, then the same scenario
happens again.
Any ideas on a fix? I am running the latest firmware on the router, and the
latest drivers for my network card.
All help appreciated.

--
Replace [dot] to reply
Bolts 03/04 Stanley Cup Champs
Arsenal 03/04 Unbeaten
Rays 03/04 not last in AL East