The same here. I was totally shocked.

I updated Avast virus database and on the next click (in my own website) I got virus warnings. I went offlie and scanned my computer. Avast found about 3000 infected files. The program almost all html files reported as infected with HTML:Script-inf, HTML:Iframe-inf. I sent all “infected” files to the quarantine because I had a similar virus some time ago which infected all index.html, index.php files.

When I came back online I discovered that Avast reports as infected almost all websites, including Google, cnn.com etc.

I got a warning from Avast that last update was not successful. Any attempts to update virus database returned errors. After some time update was successful and all “viruses” are gone.

Now I want to know if there is any way how to recover quarantined files. Some of the carantined files are very important.