Hello,
You may try the following;
1.) Right click anywhere on your desktop and click "NVIDIA control panel."
2.) From there locate the "3D Settings" expandable menu. (To expand it, click the +).
3.) Once expanded, click the blue text titled "Manage 3D settings."
4.) Once inside of "Manage 3D settings" you will notice 2 tabs. One titled "Global Settings" and the other titled "Program Settings.
5.) In the "Global Settings" tab, you will see many options that you can change in a list below. The ones that you should be concerned about are as follows.
6.) The first is, "Power management mode." Yours, by default it is set to "Adaptive." Well, it should be set to "Prefer Maximum Performance." To switch this setting simply click "Adaptive" and then change it to "Prefer Maximum Performance." After this click "Apply" at the bottom right hand side of the window.
7.) The second is, "Texture filtering - Trilinear optimization." If this is set to "Off," simply turn it to "On." After this click "Apply" at the bottom right hand side of the window.
OR
You may try;
Do a clean installation. Go into Windows' uninstaller, and manually remove everything with the name Nvidia. You'll have to restart at least twice (once for graphics driver and another time for sound driver, so save them for last). Then use Display Driver Uninstaller, which you can download here:
http://www.guru3d.com/files_get/display_driver_uninstaller_download,9.html
Boot to safe mode, check the "remove C:\Nvidia folder" option, and then click the action to uninstall and restart.
Once you're normally back into Windows, go ahead and manually install your nvidia driver again. That should clear out any driver issues. If it doesn't work, there's something else, but it definitely seems driver related, so give this a shot first. It'll take only about 10 minutes or so (depending on how fast your computer restarts).