Router / Vista issue

Hi, im hoping someone can help me with a weird thing i have happening.

I installed vista at the weekend and thought no more of my internet because it worked, but today when i tried accessing the router (phillips SNB5600) it wont let me it just times out, wether using firefox or IE and wether pinging in a command prompt it does exactly the same, im getting desperate now the wife wants to play on the xbox 360 and cant as it fails live tests at DNS, and when i do ipconfig/all it dosent show a gateway either.

War and peace i know, hope its enough info for someone to help me.

Thanks