Hi,

Thank you writing to the Dell Community Forum.

The Windows 10 drivers for Nvidia GeForce GTX 960M is currently not available from Dell. Request you to postpone the upgrade till the drivers are available from Dell. 

If you are still willing to upgrade to Windows 10, you can try the Windows 10 drivers directly from the Nvidia site:

http://www.nvidia.in/Download/index.aspx?lang=en-in 

However, Dell drivers would be recommended as they would be customized for the graphics card on your system.  

You have a whole year to wait for the right drivers. The upgrade will be free until July 2016. If the win 10 drivers never are available, you can stay with the OS you have now. No need to make a reservation. That's just a marketing ploy. It's always good to wait a while before upgrading to a new OS anyway. 

Just as with windows 7 , 8 , 8.1  vista drivers of the correct flavor aka 32 bit or 64 bit work fine with10.

You may have to install Directx June 2010 and re enable legacy directshow in control panel.

As for the Geforce 960 they released drivers for this  works fine with windows 10 insider preview 10074

Product key: 6P99N-YF42M-TPGBG-9VMJP-YKHCF

Current build is 10130

http://windows.microsoft.com/en-us/windows/preview-iso

352.84, is the first WHQL-certified and latest recommended driver for all pre-release Windows 10 testing.

http://www.nvidia.com/download/driverResults.aspx/84889/en-us

GeForce 900 Series:

GeForce GTX 980, GeForce GTX 970, GeForce GTX 960

GeForce 700 Series:

GeForce GTX TITAN Z, GeForce GTX TITAN Black, GeForce GTX TITAN, GeForce GTX 780 Ti, GeForce GTX 780, GeForce GTX 770, GeForce GTX 760, GeForce GTX 760 Ti (OEM), GeForce GTX 750 Ti, GeForce GTX 750, GeForce GTX 745, GeForce GT 740, GeForce GT 720, GeForce GT 710, GeForce GT 705

GeForce 600 Series:GeForce GTX 690, GeForce GTX 680, GeForce GTX 670, GeForce GTX 660 Ti, GeForce GTX 660, GeForce GTX 650 Ti BOOST, GeForce GTX 650 Ti, GeForce GTX 650

Follow the instructions here and let us know if you still get the error:

http://answers.microsoft.com/en-us/windows/forum/windows_10-win_upgrade/is-my-graphics-display-or-bluetooth-device/280f4f75-815d-4f79-b145-45108386bbaa