Generic PUA EH is a specific detection used by AVG Antivirus, Avast Antivirus, ESET Antivirus, Microsoft Security Essentials and other antivirus products to indicate and detect a Potentially Unwanted Program.
A potentially unwanted application is a program that contains adware, installs toolbars or has other unclear objectives.
Generic PUA EH got on your computer after you have installed a freeware software (video recording/streaming, download-managers or PDF creators) that had bundled into their installation this browser hijacker. This Potentially Unwanted Program is also bundled within the custom installer on many download sites (examples: CNET, Brothersoft or Softonic), so if you have downloaded a software from these websites, chances are that Generic PUA EH was installed during the software setup process.