DNG3500 Router problem - no internet

I had a problem a few days ago when the computer that my DGN3500 router was connected to by ethernet connection could not access the internet via IE 8.
There was a problem with the Intel Pro 100VE connection and I reinstalled this, but whilst my computer connects to mthe router and thence other computers and printeres on the wireless network, I still get "cannot display webpage" errors when I use IE 8 or Firefox.

All other computers connected to the router by wireless have an internet connection, except my computer. When I unplug the wired connection to the router and use a wireless connection, the computer still refuses to show web pages. It is able to access the Netgear router setup site fine.

Very new to this, and any advice would be greatly received. My computer runs XP Service Pack 3.