First off, it sounds like you're having issues with your browser, if you can't use multiple websites. Your browser is what you use to view the internet. In my case, I use Firefox. You might also be using Safari, Internet Explorer or Chrome, or in some cases, something else entirely.
You can find the version number by looking in your menu bar and clicking the browser name, and then "About ___". In my case, I'm on Firefox 12.
You might first review the tips here:
My first inclination in your case would be to make sure you're running a current version of your browser, and that you have all relevant updates to your computer operating system. If that's all current, and you can't get WordPress or Blogdesk to work, you might try a different browser (as outlined above) to see if that helps.
Beyond that, in your last post, timethief asked you a bunch of additional troubleshooting questions. I know it's a lot to go through, but if you can give us any additional information, we may be able to pinpoint the issue. To quickly refer back to that post, the link is below:
Let us know if any of these ideas help you out!