[EASY GUIDE] dl1yff.de is related to Intel graphics cards and Intel's it's non- essential to several Windows versions, such as Windows 7, Windows , and. The dl1yff.de process is part of Intel Graphics Persistence Module of Intel. Numerous user comments suggest it is not essential to Windows or 7 and. Desktops with one monitor may allow disabling "dl1yff.de" using "msconfig" and "startups," although Intel advises not to. dl1yff.de file information. The file dl1yff.de is located in the C:\Windows\System32 folder. C:\Windows\system32\dl1yff.de for Windows 95/98/ME, C:\Winnt\System32 for Windows NT/, or C:\Windows\System32 for Windows XP/Vista/7. Feb 20, If you've noticed dl1yff.de process running in the Task Manager under Search For any Process Running in Windows 7 Online Using.