From what it says on the website, Avast is only used with Windows operating systems. There is no mention of Mac operating systems in the system requirements. Iain From: Sue Morgan Sent: Thursday, March 25, 2010 7:37 PM To: access-uk@xxxxxxxxxxxxx Subject: [access-uk] Avast on a Mac. Hi. My Mum and Dad have a Mac computer and I'm wondering if Avast will work on it. Mac's don't get viruses, but my Mum is using some files on a thumb drive and it has some viruses on it. I know that, because I scanned the thumb drive for viruses last night and there were about 36. Can I download Avast onto my Mum and Dad's machine? Thanks. Sue. E-mail suejinglejungle@xxxxxxxxx Windows Live Messenger sue@xxxxxxxxxxxxxxxxxx Skype suemorgan1006 Mobile 07968825286 I'm also on Facebook and Twitter