Today Avast detected 3 threats when I ran a full system scan. The threats are the file hpzstc09.exe which belongs to my HP printer. I would like to know if this is a false positive because I had a similar problem before. That problem was solved after updating Avast.
https://forum.avast.com/index.php?topic=69944.msg587071#msg587071
You can report a possible FP here: http://www.avast.com/contact-form.php