Must be an Inspiron 7778 (there is no Latitude 17 7778).  If so, no - the system does not support an active pen. The largest Dell systems that have active pen support are the 15" ones. The operating system will support a pen, but there's no protocol involved -- the screen lacks the digitizer required to work with an active pen (and no, there are no screen upgrades that will work with one).  
Is possible to setup and use the  PN338M Pen in my Latitude 7778? I bought this pencil (expensive) I could not configure it, is there an application or driver that allows me to use it? Everywhere I read that it is not supported, but the screen and the operating system have the protocol for that. Ill aprecitae any tip.   thanks for your help  
Dell active PEN PN338M in Latitude 17 7778 2-in-1