In case anyone has been unknowingly infected by the DNSChanger thingy, the DNS server it uses is getting turned off by the FBI on March 8th, so anyone infected by it will be unable to connect to anything on the internet that uses a domain name (which lets face it, is almost everything).
If you visit this site and it's green with no download link, then you aren't infected:
http://www.dns-ok.de/
There is a repair tool here:
http://techblog.avira.com/2012/01/23/avira-dns-repair-tool-released/en/
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