on my PC it was this special option which was activated I do not know why but it was after I installed 40.41 so it seem there is a bug or something like this I remember that this isn't the first time an earlier det had the same problem (donnu which one) so its recommended to check if it is enabled or not and it only results in OpenGL performance 3dmark wasn involved in any way

thats not only my PC !!!!

If when you boot your computer and a box pops up saying "can not load nvqtwk", run a search in the registry and delete that entry. I had that error box and I found only 1 reference to it in the reg and I deleted it and it cleared up that box. Also, if you are running XP, look in the system32 folder and scroll down to where all the nvidia files are and delete the files from older versions. Also, go to add/remove programs and uninstall the old drivers, then reinstall the new ones.