I'm having a similar problem, and would love to have some help. I know this post is rather old, but hopefully someone can help. I currently have a pretty old desktop, but it's been good to me up until now. I have a compaq presario model 5102US. My internet connection is always fine, and yet I cannot get to any websites, always showing the "page cannot be displayed" sign. After I restart, everything will by fine for a little while, about 5-10 minutes or so, and then the problem returns. At first, I ran an adaware scan and a Norton scan (both are up to date). When that didn't work, I went as far as reformatting my whole computer. And still, no results. Then, I figured it may have been my network card, so I bought a new one. Still, nothing. If anyone could help, that would be great.