According to the message you posted the problem doesn't seem to be with the >net but with the HP Suport Framework. Either your computer or a peripheral is made by HP. Either the software or an assosuated driver...or both is corrupted. According to this site HERE
that utility requires .NET 3.5 or later. I would suggest downloading and installing .NET 4.0 from HERE.
. Hopefully that will solve your issue. If not I would suggest uninstalling and reinstalling the HP Support Framework from the prior link.