When you get a BSOD error,find all minidumps/fulldumps file and save them as zip file,don,t you forget to rename zip archive file with unique name (yout forum nickname,problem with xxxx Avast BSOD) and send Zip file to Avast team via Avast FTP or you can generate Avast support package and send them to Avast via FTP of course you have to rename Avast support package aswell,I prefer Avast support package.
Avast FTP server ftp://ftp.avast.com/incoming/
FTP client: http://www.filehippo.com/download_filezilla/