If you think that this file contains a virus or another malware, please download a virus scanner.
If hppgfax.exe is using too much CPU or too much memory in your system, it is possible that your file has been infected with a virus. Try to install an antivirus to see if it helps.
If you want to remove hppgfax.exe from your computer, just go to Start > Control Panel > Add/Remove programs and select HP LaserJet 3300 Series from the list.
You may try contacting Hewlett-Packard Co., the developer of hppgfax.exe and ask for more information.