Firefox will not load certain major websites.

Firefox and IE on my computer refuse to load certain major websites. The sites are not down, for they work fine on other computers in my house. Yesterday it was just facebook, now it's weather.com as well. It keeps saying server won't load the site. Whatever is causing this is on my system alone. I've run Malwarebytes and Advanced Systemcare along with ESET and a few others. Everything's been cleared off and updated.
I'm betting firefox is corrupt AGAIN, but last time I reinstalled it royal FUBARed itself and I lost everything (mainly annoying for flash game saves and bookmarks) I woud like to avoid that this time around.

Do a malware check with some malware scan programs.<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 the database before doing a scan.<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 and [[Searches are redirected to another site]]

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