A misfiring signature update from anti-virus developer Avast triggered all sorts of problems on Wednesday.
Avira is a well known company from Germany that creates very good antivirus software.
At the end of the line, add an entry that starts with the IP address of the Avira update server, followed by a space and finally the hostname which is personal.
Save the file and now Avira will always connect to the IP address that you’ve specified in the HOSTS file to download the updates.
The withdrawn update incorrectly labelled various libraries (dlls) on Windows PCs as potentially malign, crippling software installations in the process.
More specifically, legitimate programs were classified as something called the "Kryptik-PFA" trojan, shuffled off to quarantine and blocked.