Internet Problem

[Davey_Rose]

So, I got this problem for weeks now. When I use the internet browser and  browse to a website, I have to refresh 10 times to get it working, or I get a half loaded page (No pictures, plain white background) or even no page at all (after pressing refresh 30 times it works). I have no idea how to solve this, and I think it is a PC related problem, as the WiFi on our network works flawless with my mobile phone.
I'm running Windows XP.

Thanks for reading, hoping for some help.

 :ps: I think it is not browser related, as it does the same in IE and Safari.

[Clone]

Check your firewall settings, make sure your browsers are allowed through.

[Davey_Rose]

Check your firewall settings, make sure your browsers are allowed through.

It used to work, why shouldn't it now?