Some sites recently became blocked on my computer. I either get I'm not connected to the internet or redirected. How do I fix this?

Question

I went on vacation, when I came back the following websites were blocked. Facebook, Cracked & TMZ. I cannot access them from this computer either with Fixfox or IE. They can be accessed by other computers at this work. Is there a way to unblock them?
With Facebook, I get the message saying I'm not signed onto the internet. With the other 2, I get redirected to Yahoo.com.
Anybody have any ideas?
Thanks

Answer 1

Do a malware check with some malware scanning 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 their databases 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