Odd intermittent wireless problem

Hi all,

I'm using the onboard wireless on the P5B Deluxe (with a Netgear router from Sky), and all had been fine up until recently, but I'm having problems now. Every few days, with no changes from myself, my wireless connection will report that it's connected with full signal strength, but I won't be able to load any web pages, or use Steam or anything like that. My firewall is off, and I'm using windows to configure the connection rather than Asus's software, and my laptop and 360 which use the same connection are fine, and the problem will seemingly fix itself for a while and then happen again a few days later. I've had a quick look around but can't find an answer to why this might be, can anyone help?

Thanks