Problem loading web sites, but only if they are not in the tabs or navigation bar

Question

First, sorry for my English :(
I have trouble since 2-3 weeks now when I want to open a new page. I can use my tabs (Gmail, Facebook, etc) or use the addresses that I have in my navigation history. But I'm not able to do much else.
If I type an address, it won't load. If I use the Google Ad-On to look for something, not loading. But if I am on Facebook and click on a link, it works. I can also use that link (per example Youtube) to look something else.
I hope it's clear :) Not easy to explain a computer problem, worst when it's not in your first language :P

Answer 1

Do a malware check with some malware scanning programs on the Windows computer.<br />
You need to scan with all programs because each program detects different malware.<br />
Make sure that you update each program to get the latest version of their databases before doing a scan.<br /><br />
*http://www.malwarebytes.org/mbam.php - Malwarebytes' Anti-Malware
*http://www.superantispyware.com/ - SuperAntispyware
*http://www.microsoft.com/windows/products/winfamily/defender/default.mspx - Windows Defender: Home Page
*http://www.safer-networking.org/en/index.html - Spybot Search & Destroy
*http://www.lavasoft.com/products/ad_aware_free.php - Ad-Aware Free
See also:
*"Spyware on Windows": http://kb.mozillazine.org/Popups_not_blocked