Working with firefox 28 on WinXP. https sites load well, but http sites do NOT load at all. Same happens on other browsers

Question

I've tried uninstalling, downgrading, upgrading Firefox (from version 17 to Aurora)
and still the problem persists! I've shut down firewall, performed malware checks,
cleared cache, history and cookies, started in safemode, and still nothing!!
'https' sites (such as Facebook) load perfectly well, as opposed to 'http' sites that do
NOT load at all, getting the following error:
«Firefox could not establish connection to server in www.example.com.
- The website may be temporarily unavailable or busy. Try again in a few moments.
- If you can't load any page please check your computer Internet connection.
- If your computer or Internet connection is protected by firewall or proxy,
verify if «browser» has permission to connect to the Web.»
I have the same version of firefox running on win7 on other computer and it works
normally!
Some 'http' sites will load if I insert an 's' after 'http' making them apparently
'https'.
Help please!! Thank you!!

Answer 1

well here it is, but are you able to...., but how big can you see this image, or are it just to load it down to paint, well here it is, and as i said, you must translate it, or you must tell me if it are possible and how i change the language, because this was downloaded on norwegian.well, as i said here is it!