how to install tensorflow with gpu on windows?

i installed cuda toolkit 9.0 and downladed cudnn 7.0.5. what is the next step??
i havnt changed or appended any path files.
im getting error:
File “C:\Users\balaraman\Anaconda3\envs\tensorflow\lib\site-packages\numpy\core_init_.py”, line 16, in
from . import multiarray
ImportError: DLL load failed: The volume does not contain a recognized file system.
Please make sure that all required file system drivers are loaded and that the volume is not corrupted.

I didn’t try Windows install, but there are instructions:
https://www.tensorflow.org/install/install_windows
Try go ahead with python-pip:

pip3 install --upgrade tensorflow-gpu