Photoshop CS6 opening photos in a black window upper left screen with only 1/4 of the image showing

Two things to try:

Reset the photoshop cs6 preferences by going to

C:\Users\UserName\AppData\Roaming\Adobe\Adobe Photoshop CS6

and deleting the

Adobe Photoshop CS6 Settings folder

(first move any saved workspaces out of Workspaces so you

can put them back after the preference reset)

Then in photoshop go to Help>Updates and see if you can get the 13.0.1.3 update

Are you using a laptop or desktop that most likely also has an integrated graphics processor (Intel for example) in addition to your discrete Nvidia graphics?

One or the other needs to be switched off so photoshop is only trying to use one graphics processor and not both which causes issues like your seeing.

UPDATE:  I went into preferences--> performance--> Detected graphics processor and unchecked the GP NVIDIA.  It resolved the issue, but I need the graphics processor to edit.  I updated my windows OS, updated the NVIDIA, restarted everything.  Problem is still occuring when I add the graphics processer on CS6 preferences.  Any other suggestions would be greatly appreciated.