Is this a false positive

Viruses and worms
1

I did a scan with avast and it found this as a threat: C:\Program Files\HP\Digital Imaging{0E37765E-45AE-4830-A12C-E5DADD758472}\setup\hpznop01.exe
It was detected as Threat:Win32:Malware-gen

None of my previous av softwares found this as a threat until avast did just now. When I uploaded the file to virustotal, avast and gdata(or something like that) was the only thing that found it as a threat. Btw, this file was part of the installation of a HP printer.

2

If only GData and avast detect it - GData uses avast as one of its two scanners so counts as 1 detection and almost certainly an FP.
Send the sample to avast as a False Positive:
Open the chest and right click on the file and select ‘Submit to virus lab…’ complete the form and submit, the file will be uploaded during the next update.