would like to install adb driver but there is no 'install' menu when i right click on the .inf file.

I hope this helps someone in the future.  I recently had the same issue with Windows 10, the install option was not available when I right-clicked the android_winusb.inf file (and tried for 3 days).  The EXTRACT was the key.  When you originally download the file from Oculus ADP Driver using Window explorer the file will open from the Username>AppData>Local>Temp>Oculus-adb-driver-2.0.zip and this may not give you the install option.  BEFORE you move forward from here, click "Temp" and then the driver will show with a zip icon folder.  Right click this folder and extract all.  The follow the regular steps and right click android_winusb.inf file and it should show the install function.  Hope this helps.