CUDA & TMPGEnc 4 XPress

how activate CUDA under TMPGEnc 4 XPress v4.5.2.255.
I have a 8800 GT with 178.13 nVidia drivers.
I am with XP pro x64.

In the window “Preferences” , I have only “CPU” and not “CPU/GPU”.

I think CUDA is not installed correctly.
How can help me ? I am looking for a solution on the web, but there isn’t any tuto &/or FAQ on the installation of CUDA

haha

you dont have a gpu enabled TMPEG!

1st TMPEG page

2nd TMPEG page

1st link = “The beta version of TMPGEnc using CUDA technology is available from Pegasys upon request for press purposes only.”

2nd link =