IE & Firefox do not work in Vista but IM does & there is a connection

So I am working on a Vista Home premium machine (HP laptop). Currently IE & Firefox both will not connect to the internet. It delivers a blank page. Both Yahoo IM and MSN IM work. I can ping websites with no issues. I have removed everything, No firewall, no antivirus no external program that would block access to to net. Everything else has access to the net except the browsers will not work. The client is using a 2Wire (Yahoo DSL) wireless router/modem. I have tried to restore the machine to a previous point and it still will not allow IE & Firefox to connect. Again just a blank page.