Windows 7: Browsers loading pages only after reload

Hi, I'm having a strange problem with my network and internet connection. The problem first occurred about a week ago, with all browsers (IE, Firefox, Chrome, Safari) suddenly refusing to load webpages. The pages would load a moment until showing the "Server not found". After a couple of reloads (depending on the page) the browser would load the page.

The other problem is in my home network, which is basically useless at the moment, since my computers do see each other, but I cannot access them over the network, like I used to before. My router is D-Link DI 524. One computer is connected to LAN, and the other to WLAN, and both have the identical problems.



So far I have tried Anti-virus scans on both computers, anti-malvare and anti-spyware scans, but none have found anything and haven't helped. I have tried to reboot the router and the modem several times (incl factory reset), but the problem persists.

I have three computers in the home network, 1x Windows 7 Home Premium 64bit, 1x Windows 7 Home Premium 32bit and a Windows 7 Professional 32 bit laptop