Hit the windows key, type CMD right click command prompt and run it as administrator paste this in ftype txtfile=C:\Program Files (x86)\Notepad++\notepad++ %1hit enter and enjoy
If you want real help you need to give a little more information.
Example: My Build
CPU: Intel i7 4770k
GPU: Nvidia GTX 780 Ti
MoBo: Asus Maximus VI Hero
RAM: 16GB
Cant tell you much without the part numbers.
also the resolution of your monitor is pretty important.