A quick google search revealed dgen.exe to be associated with several Ubisoft WWII flying simulators, and an assortment of different computer viruses. If it was still possible to run programs like rkill and malwarebytes on Windows you could take care of this easily. However, Windows included several updates in the last few months that cause the machine to freeze up and hang until you force a reboot when these programs are launched, so there's basically nothing you can do.