hello , i had 2 times o BSD when i try to install avast
How can I help you ?
Hi 
Create 7z file and send mini dump+full dump file to Avast via FTP server. How to send files to Avast via FTP server.-- https://support.avast.com/index.php?_m=knowledgebase&_a=viewarticle&kbarticleid=18
Free FTP client: http://filehippo.com/download_filezilla/
PS:Rename 7z file with unique name:your name in avast forum+BSOD
Thank you.
what antivirus did you have before installing avast ?
did you uninstall it before installing avast ?
have you run a removal tool to clear any leftover files that may conflict ?