Why is my license not working when it says 4 computers for 1 year when I bought it?
You might try to email sales AT avast.com and see if they can help you with your license file.
Or click here: http://support.avast.com/index.php?languageid=1&group=eng&_m=knowledgebase&_a=viewarticle&kbarticleid=455#idt_05