I am not able to install the ADB drivers/Oem drivers for my one plus one.
I have tried the following three methods given by the link and restarted my system
http://www.technobuzz.net/install-oneplus-one-usb-drivers-windows/
PLEASE HELP
I should have posted this much earlier
This was a bug in OPO android lollipop. Many devices(NOT on all ) were not able to connect to the windows using drivers. This was already fixed in marshmallow.
For more details refer: