On 12 March 2012, the FBI issued an update regarding the case of the DNS Switcher Malware Case they busted in November 2011. The DNS Malware, if it infects your computer could cause your internet page to be directed to a website you don't want it to go to, or even prevent you from using the internet.
If you want to see if your computer might be infected by this malware, the FBI has partnered with DCWG to check your computer for free;
As of 22 March 2012, DCWG reports that they estimate over 350,000 computers are infected with this malware.
Check your computer out today. Make sure you have valid, active Anti-Virus on your computer.
I encourage everyone to run this check today! I checked mine and I am not infected!