Avast Free
Virus or unwanted program ‘TR/Crypt.XPACK.Gen3 [trojan]’
detected in file 'C:\WINDOWS\Temp_avast5_\unp192351023.tmp.
Action performed: Allow access ???
Please don’t use two antivirus products simultaneously - you’ll get conflicts such as this one.
Never install two antivirus (see reply from quietman7)
http://www.bleepingcomputer.com/forums/index.php?s=7c8217673a726b92cfc91ecfd4294a29&showtopic=260844&view=findpost&p=1441638