There is an issue with the 64 bit in that it can initialize on your CPU Graphics rather than your Graphics Card.
There are a couple of ways to fix this. In the control panel for your video card, tell it use the video card for the 64 bit version (eso64.exe). You may also have to go into Power Options for your computer and tell the system to use the Video Card. Usually this is done by selecting High Performance for Video (and it may be in a couple places you have to do this).