Ciao e benvenuto, è compatibile http://www.microsoft.com/it-it/windows/compatibility/CompatCenter/ProductDetailsViewer?Name=avast%20antivirus%202014%20free&vendor=AVAST%20Software&Locale=1028%2C1031%2C1036%2C1040%2C1041%2C1042%2C1043%2C1046%2C1049%2C2052%2C3082%2C3084&ModelOrVersion=9&BreadCrumbPath=avast&LastSearchTerm=avast&Type=Software&tempOsid=Windows%208.1
http://www.avast.com/it-it/premier#sysreq