I had purchased avast! and than I had to reinstall windows. How do I re-install my avast?
avast! 6.x Pro Antivirus: http://files.avast.com/iavs5x/setup_av_pro.exe
avast! 6.x Internet Security: http://files.avast.com/iavs5x/setup_ais.exe
If you saved your license (of course you did) once installed you will need to enter that.
If you didn’t save the license.avastlic you will need to get a copy:
Resend avast License http://www.avast.com/resend-license-paid.php, you will need to enter the email that you used when purchasing the license, e.g. the one that the original email with the link was sent.